A migrant covers his face as he runs from tear gas, thrown by the U.S border patrol, near the fence between Mexico and the United States in Tijuana, Mexico, November 25, 2018. (Xinhua/REUTERS)

LOS ANGELES, Nov. 25 (Xinhua) -- The U.S. border patrol on Sunday suspended all traffic at a busy crossing between San Diego, California and Mexico's Tijuana, where thousands of migrants are massing in a makeshift shelter to apply for asylum.

The U.S. Customs and Border Protection (CBP) agency in San Diego said in a series of tweets that traffic and pedestrian crossings in both directions were suspended at the San Ysidro port of entry.

At least 1,800 Central American migrants, mainly from Honduras, have arrived in groups in the Mexican border city of Tijuana last week, and more are expected to come, authorities said.

On Sunday, police in Tijuana reportedly broke up a protest of migrants, setting up chaotic scenes of protesters running in different directions.

However, the CBP tweets didn't confirm reports that migrants had pushed through a blockade trying to cross the border post.

The incident came hours after U.S. President Donald Trump renewed threats that the United States would close the U.S.-Mexico border "if for any reason it becomes necessary."

"Migrants at the Southern Border will not be allowed into the United States until their claims are individually approved in court," he tweeted Saturday evening. "All will stay in Mexico."

The tweets came after The Washington Post reported earlier on the day that Mexico's incoming government has agreed to support the U.S. government's plan to remake U.S. asylum policy.

However, Mexico's incoming Interior Minister Olga Sanchez Cordero, who will take office next month, denied any type of agreements between the two sides in a statement on Saturday.