People smugglers got a bit too bold for their own good, by the sound of it. Not a good omen

The San Ysidro Port of Entry on the U.S.-Mexico border in California was temporarily closed Tuesday after four people were wounded by gunfire that erupted from three vans packed with than 70 people headed from Mexico toward the border, officials said.

An Immigration and Customs Enforcement agent and a Customs and Border Protection officer also fired their guns, said Angela Decima, a spokeswoman for the U.S. Border Patrol.

Three of the casualties were critically wounded, said San Diego, California, Fire Department Spokesman Maurice Luque. The fourth person wounded was in a separate vehicle, said Decima. The condition of the fourth person was being assessed, and a fifth person — who may have fallen while running — was injured in an incident unrelated to the shootings, Luque said. Four of the five people who were hurt were part of the entourage of cars involved in the shooting, he said. All of the occupants of the three vehicles were taken into custody, said Luque.

The border incident occurred at 3:25 p.m. (6:25 p.m. ET), police said. The crossing point, officially declared a crime scene, will remain closed for several hours while the San Diego Police Department investigates.