Captain is arrested after four migrants drowned and 25 were injured in boat capsize off perilous San Diego coast: Border Patrol warned about 'dramatic' surge in coyote boats TWO DAYS before tragedy Customs Border Patrol sent out a warning on Friday April 30 about a 'dramatic' surge in the boats Agents said there would be a heightened law enforcement response in San Diego to deal with the increase They warned of the dangerous waters and said there was a severe risk of hypothermia and drowning On Sunday, four died and 25 were thrown into the water when their overcrowded boat capsized It's unclear where they had come from but the location is a hot spot for migrants coming from Mexico