About 500 migrants on the Mexican side of the border overwhelmed police blockades near the San Ysidro Port of Entry on Sunday, two journalists in Tijuana told CNN. That forced a temporary closure of the major border crossing into San Diego. On the US side, 69 people were arrested for illegally crossing the border, US Customs and Border Protection Commissioner Kevin McAleenan said Monday. Tijuana police said they arrested 39 people Sunday on the Mexican side. Those identified as trying to rush the US border illegally will be processed for deportation in their home countries, Mexico's Interior Ministry said.US President Donald Trump threatened to close the border "permanently if need be." He also claimed many of the migrants are "stone cold criminals," but gave zero evidence to support that claim. "Mexico should move the flag waving Migrants, many of whom are stone cold criminals, back to their countries," Trump tweeted Monday. "Do it by plane, do it by bus, do it anyway you want, but they are NOT coming into the U.S.A. We will close the Border permanently if need be. Congress, fund the WALL!
Projectiles and tear gas
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 entry into the United States. The migrants' presence has drawn demonstrators — for and against them — and threats from 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.
How the incident began
More than 5,600 migrants have taken shelter in Tijuana's Benito Juarez Sports Complex, Mexico's Social Development Secretariat (SEDESOL) said. The rough tally includes 3,598 men, 1,041 women and 993 children, SEDESOL Director Mario Figueroa said.A peaceful march was planned for Sunday, starting at the sports complex and continuing to the border. In response, CBP deployed additional personnel to San Ysidro in expectation of demonstrations on both sides of the border.
As migrants reached the border area, some protesters split off toward multiple locations, CBP said. Some attempted to enter through San Ysidro and were turned away, the agency said. Others tried to enter "directly east and west of the border crossing." After they were prevented from entering the port of entry, some of the migrants "attempted to breach legacy fence infrastructure along the border and sought to harm CBP personnel by throwing projectiles at them," Secretary of Homeland Security Kirstjen Nielsen said in a statement. "DHS will not tolerate this type of lawlessness and will not hesitate to shut down ports of entry for security and public safety reasons. We will also seek to prosecute to the fullest extent of the law anyone who destroys federal property, endangers our front-line operators, or violates our nation's sovereignty," Nielsen said.Mexico's Interior Ministry said federal and local authorities stopped the migrants Sunday from crossing the border illegally. It described Sunday's incident as "acts of provocation" and warned that far from helping the migrants' cause, it could result in a serious incident on the border.
'People of Tijuana will not pay'
The mayor of Tijuana said on Sunday that he would not let the migrants' actions damage the city's relationships across the border. Residents of Tijuana work, study and visit the United States each day, and the border closures affect them, too, Juan Manuel Gastélum Buenrostro tweeted Sunday. 
The mayor previously said he will not commit city resources to the migrants, including money or public services. He called on the Mexican government — specifically, President Enrique Peña Nieto and his secretary of domestic affairs — to provide assistance."The people of Tijuana will not pay for the stay of these migrants. I will not send Tijuana into debt, just like I have been able to avoid the last two years," he said in a November 22 Facebook post."We are dealing with a humanitarian crisis and the federal government must step up to its responsibility!!!"
Mexico will get a new government soon
Mexican President-elect Andrés Manuel López Obrador takes office December 1.On Saturday, the Washington Post reported that Obrador's government supported a Trump administration plan to require people seeking asylum to remain south of the US border while their applications are being processed.
"For now, we have agreed to this policy of Remain in Mexico," Olga Sánchez Cordero, López Obrador's top domestic policy official as Mexico's interior secretary-elect, told the Post. She also called it a "short-term solution."But Mexico's incoming government on Saturday night denied that an official deal had been made regarding migrants staying in the country before entering the United States, Sánchez Cordero, said according to a statement acquired by CNN."Mexico's next federal administration does not consider within its plans that Mexico assume the condition of 'third secure country' for the attention of Central American migrants or citizens of other countries in Mexican territory or those who will have that intention in the future," Sánchez Cordero said in the statement.
Journalist Alfredo Alvarez and Jorge Lebrija reported from Tijuana. CNN's Emanuella Grinberg and Mariano Castillo wrote from Atlanta and Susannah Cullinane wrote from Auckland. CNN's Holly Yan, Geneva Sands, Amanda Watts and Artemis Moshtaghian contributed to this report.
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