US border agents fire tear gas as migrants climb Tijuana fence

Migrants approaching the U.S. border from Mexico were enveloped with tear gas Sunday after a few tried to breach the fence separating the two countries.

U.S. agents shot the gas, according to an Associated Press reporter on the scene. Children were screaming and coughing in the mayhem.

Honduran migrant Ana Zuniga, 23, said she saw migrants open a small hole in concertina wire at a gap on the Mexican side of a levee, at which point U.S. agents fired tear gas at them.

"We ran, but when you run the gas asphyxiates you more," she told the AP while cradling her 3-year-old daughter Valery in her arms.

Mexico's Milenio TV also showed images of several migrants at the border trying to jump over the fence. A few yards away on the U.S. side, shoppers streamed in and out of an outlet mall.

U.S. Border Patrol helicopters flew overhead, while U.S. agents held vigil on foot beyond the wire fence in California.

U.S. Customs and Border Control in San Diego said on Twitter that the northbound and southbound lanes at the San Ysidro port of entry were "currently" closed.

"Pedestrian crossings at the San Ysidro port of entry are also suspended at both the East and West facility," it said, adding: "Updates will be provided."

U.S. President Donald Trump took to Twitter again Sunday to express his displeasure with the caravans in Mexico.

"Would be very SMART if Mexico would stop the Caravans long before they get to our Southern Border, or if originating countries would not let them form (it is a way they get certain people out of their country and dump in U.S. No longer)," he wrote.

Several hundred Central American migrants on Sunday pushed past a blockade of Mexican police standing guard near the international border crossing to pressure the U.S to hear their asylum claims.

The migrants carried hand-painted American and Honduran flags and chanted: "We are not criminals! We are international workers!"

More than 5,000 migrants have been camped in and around a sports complex in Tijuana after making their way through Mexico in recent weeks via caravan. Many hope to apply for asylum in the U.S., but agents at the San Ysidro entry point are processing fewer than 100 asylum petitions a day.

Some of the migrants who went forward Sunday called on each other to remain peaceful.

They appeared to easily pass through the Mexican police blockade without using violence.

A second line of Mexican police carrying plastic riot shields stood guard outside a Mexican customs and immigration plaza, where the migrants were headed.

That line of police installed tall steel panels behind them outside the Chaparral crossing on the Mexican side of the border, which completely blocked incoming traffic lanes to Mexico.

Irineo Mujica, who has accompanied the migrants for weeks as part of the aid group Pueblo Sin Fronteras, said the aim of Sunday's march toward the U.S. border was to make the migrants' plight more visible to the governments of Mexico and the U.S.

"We can't have all these people here," Mujica told The Associated Press.

Tijuana Mayor Juan Manuel Gastlum on Friday declared a humanitarian crisis in his border city of 1.6 million, which he says is struggling to accommodate the crush of migrants.