The deployments were not directed at the migrants attempting entry on the US side or at the fence line.
Some of the migrants threw rocks as others lifted children over the razor-edged wire late Monday in the San Diego sector, the agency said a statement, which was based on initial reports.
In its statement following the incident, CBP said that the volleys were not aimed at migrants attempting the crossing, but at rock-throwers who prevented the agents from helping the children being dropped over the border fence.
But the Associated Press reports rocks were only thrown after agents fired tear gas, and a Reuters witness says one migrant was struck by what seemed to be a tear gas canister. "Initial reporting indicates that once the attempted illegal entry was thwarted by agents, the mob began pushing women and minors to the front, forcing minors to climb risky concertina wire, and encouraged conveniently invited media to begin filming their illegal acts".
The United States has also pushed Mexico to house Central American migrants while they seek US asylum.
The tear gas and pepper spray forced the rock throwers to flee while numerous migrants who were trying to illegally cross the border also turned back. He said Mexico "advocates respect for migrants' human rights, security and integrity, while calling for respect for laws on both sides of the border". CBP estimated that about 150 migrants attempted to sneak into the U.S. illegally.
On Nov. 26, Border Patrol agents also launched tear gas into Mexico to repel migrants that had broken away from a peaceful protest and attempted to cross the border illegally.
An AP journalist also saw U.S. agents fire plastic pellets.
Most of the migrants returned to Mexico through a hole under the fence and by climbing back over the fence.
Migrants, part of a caravan of thousands traveling from Central America en route to the United States, go down a hill after failing to cross the border between the U.S and Mexico in Tijuana, Mexico Nov. 25, 2018.
Under CHP's use of force policy, the incident is being reviewed.
Amnesty International described the use of tear gas against migrants "cruel and inhumane" and called for an investigation.
It comes as the United States federal government remains shut down as President Donald Trump and Congress argue over funding for his proposed border wall.
Although President Donald Trump hasn't spoken directly about the New Year's Eve events, he did take to Twitter to condemn Nancy Pelosi for not taking a government shutdown over border security and illegal immigration seriously. The federal government began its 12th day of a partial shutdown Wednesday; it is unlikely to end before Congress resumes on January 3.
Cyrus and Hemsworth's private wedding comes after a rocky, on-again , off-again relationship between the Last Song costars. Miley Cyrus has shared pictures of her embracing partner Liam Hemsworth amid reports the couple married before Christmas.
An investigation into CBP actions will be conducted by the agency's Office of Professional Responsibility, the news release said. Jakelin and her father Nery Gilberto Caal Cuz were taken into custody on December 6 after crossing the border into New Mexico.
No one could have predicted what was to come when Ilkay Gundogan gave second-placed City a 27th-minute lead. The Ralph Hasenhuttl revolution continued as Southampton beat Huddersfield 3-1 at the John Smith's Stadium.
Gorsuch, he voted to grant the appeal, lift the judge's order and allow Trump's new policy to be enforced. But rights groups have challenged his new rules, saying they violate administrative and immigration laws.
President Donald Trump has long pushed to pull troops out of Afghanistan, considering the war a lost cause. But the Taliban said the withdrawal could in fact assist peace efforts by helping to build trust.
A flustered Bencic slammed her racket on the court as the match leveled and she never seriously threatened in the decider. Federer opened his Hopman Cup campaign in flawless style, crushing world No.91 Cameron Norrie 6-1 6-1 in 57 minutes.
The undefeated 42-year-old made use of that advantage, knocking his opponent down three times in just two minutes. Mayweather landed a good body shot and a left hook and Nasukawa goes to the mat. "I'm still undefeated.
Syria's air defences have repelled a missile attack on Damascus suburbs on Tuesday, Syrian state television reported. The Lebanese National News Agency said Israeli warplanes flew over Lebanon to carry out the raids outside Damascus.
If Hasina retains power, one of her first jobs will be to address the demands of garment workers for higher minimum wages. The leadership of Bangladesh has alternated between Hasina and Zia, allies-turned-foes, over the last three decades.
Robertson plays a wonderful ball over the top for Salah who side-foots it across to Mane and he pokes home for Liverpool's third. Liverpool outran their opponents by 114.8km to 112.7km and their pressing was ferocious.
A large winter storm coming on the heels of Christmas is expected to bring snow to Nebraska, the Dakotas and Minnesota this week. By Thursday in central Minnesota, the northwest wind could be 10 to 15 miles per hour with gusts of 20 miles per hour .
Most Asian stock markets gained Friday while Japan edged down following Wall Street's rally at the end of a turbulent week. US stocks are staging a furious late-afternoon rally Thursday, closing with gains after erasing a 600-point drop in the...
Warren burst onto the national scene a decade ago during the financial crisis with calls for greater consumer protections. It's worth noting here that Warren is originally from Oklahoma and was a registered Republican until her 40s.
If the President continues to insist on $5 billion for the wall, the House Democrats' plan would fall into that category. In one of the tweets on Monday, Trump reminded Democrats they have voted in favor of a border barrier twice before.
Cyrus posted three black-and-white photos of her and Hemsworth on her Instagram and Twitter accounts on Wednesday (December 26). That's what plenty of social media clues left by Cyrus and friends point to in the absence of official confirmation.
Manbij was seized in 2016 from ISIS by Syrian militia allied to the SDF, which controls roughly a quarter of Syria. Mr Trump's decision has emboldened Turkey to press ahead with plans to clear Manbij of Kurdish forces.
You don't know me, but my grandfather was a game warden in Montana and we spent our vacations going to our 2 national parks. The shutdown started Saturday after funding lapsed for nine Cabinet-level departments and dozens of agencies.
The former " Suits " star could be seen placing a protective hand on Kate's back as the pair made their way inside the gates. It's Meghan's first Christmas as a royal, though she celebrated with the family a year ago , in a break in tradition.
He always told me to watch the game, watch the defenders, to visualize what movement you're going to make to try to put yourself in a position to score goals or have an impact when you come on off the bench.
It said the group nearly certainly continues to target a range of global companies, seeking to gain access to commercial secrets. The US and United Kingdom have accused China of violating an agreement relating to commercial espionage.