Some members of a large group of migrants who tried to rush the US border from Mexico, prompting the closure of a major border crossing in San Diego, will be deported to their home countries, according to Mexican authorities.

About 500 migrants on the Mexican side of the border overwhelmed police blockades near the San Ysidro Port of Entry Sunday afternoon, two journalists at the scene in Tijuana told CNN.

Tijuana police arrested 39 people in connection with the attempt to cross the border illegally, the agency said in a statement on Facebook.

It said they would be reported to Mexican immigration authorities.

Mexico’s Interior Ministry earlier said those identified as having tried to cross would be processed for deportation to their home countries.

As the migrants tried to cross the border, authorities on the US side used tear gas to disperse them, the journalists said. Video of the scene showed a cloud of tear gas that sent people running and screaming, including families with young children.

US Customs and Border Protection said the migrants threw projectiles that struck several agents.

“Border Patrol agents deployed tear gas to dispel the group because of the risk to agents’ safety,” the agency said on Twitter.

The incident marked an escalation of tensions that have been mounting since groups of Central American migrants began arriving in Tijuana a few weeks ago on their journey to attempt to gain entry to the United States.

The migrants’ presence has drawn demonstrators — for and against them — and threats from President Donald Trump to close the US-Mexico border. Meanwhile, Tijuana’s mayor has called on the Mexican government and the international community for help.

The melee closed one of the world’s busiest international crossings, San Ysidro Port of Entry, to vehicle and pedestrian traffic for several hours. By Sunday afternoon, CBP reopened crossing lanes in both directions to pedestrians and vehicles.

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