On Saturday night after he crossed the U.S. border illegally, border patrol officials arrested a Honduran man who had been convicted of murder.

When officials apprehended 46-year-old Miguel Angel Ramirez near the San Ysidro port of entry in California, he admitted that he had served a 13-year sentence for robbery and murder. Officials confirmed his conviction and sentence with the Honduran Consulate in Los Angeles.

When Ramirez was released four months ago, he traveled from Honduras through Guatemala and Mexico with the current caravan of people aiming to enter the United States and claim asylum, a press release from U.S. Customs and Border Protection stated. Two other men, ages 22 and 38, were also arrested while attempting to illegally cross the border, and discovered to be Honduran nationals.

On Tuesday, U.S. agents in Ajo, Arizona arrested two men traveling with the caravan who had ties to MS-13, a notorious gang from El Salvador whose members have brutally killed numerous Americans. Border patrol officials identified Mara Salvatrucha, a young man who was caught entering the U.S. illegally, as a member of MS-13.

They also caught a 30-year-old Honduran man with MS-13 tattoos and later identified him as Wuilson Lazo-Ramos, who had a felony conviction for weapons misconduct in Maricopa County. Lazo told officials he had traveled with the migrant caravan through the dangerous parts of Mexico for safety, according to a press release.

The Department of Homeland Security has requested that more law enforcement officers be sent to the border and that a portion of the 5,800 U.S. troops stationed along the border stay longer than their initial deployment, which is slated to end Dec. 15. On Sunday, several hundred migrants stormed the border near San Diego. Some were reportedly throwing rocks at law enforcement officers, which prompted U.S. officials to use tear gas in return.

CBP Commissioner Kevin McAleenan said his agency has arrested 100 migrants for criminal violations. DHS and CBP officials have stated that they believe 500 criminals to be traveling within the migrant caravans.