Mexico looked set to shore up security near its border with the United States on Monday, and local authorities said that 39 migrants were arrested after a peaceful march devolved into mayhem when U.S. agents fired tear gas into Mexico to stop some migrants who tried to breach the international line.

Mexico's Interior Ministry said it would immediately deport those who tried to "violently" enter the U.S. from Tijuana. Meanwhile, Tijuana's municipal government said that more than three-dozen migrants were arrested for disturbing the peace and other charges stemming from the march and what followed.

On Sunday, the situation at the border devolved after a large group marched to the U.S. border to appeal for the U.S. to speed processing of asylum claims for Central American migrants marooned in Tijuana.

There, some attempted to get through the fencing and wire separating the two countries, leading U.S. agents to fire tear gas.

American authorities also shut down the nation's busiest border crossing at San Ysidro for several hours at the end of the Thanksgiving weekend.

AirTalk checks in with reporters from Tijuana, Mexico City, and Washington DC for the latest.

With files from the Associated Press.

Guests:

Maya Averbuch, reporter covering the caravan for the New York Times; she was at the San Ysidro Port of Entry this weekend, where the U.S. government used tear gas on migrants approaching the border; she tweets

Carrie Kahn, international correspondent for NPR based in Mexico City; she tweets

Nick Miroff, national security reporter covering immigration enforcement and the Department of Homeland Security for the Washington Post; he’s been following the latest on the Trump administration’s border policy; he tweets