An ambulance in Mexico was ambushed in Ciudad Juarez on Wednesday and all people inside the emergency vehicle were killed say police.

It is being reported that unidentified gunmen rammed into an ambulance carrying two paramedics and two patients, forcing the ambulance to stop, and that’s when the gunmen surrounded the vehicle and forced the four people out. They were then executed and left in the road.

Police are unsure who is behind the attack, and are still investigating.

The patients were being transported from the city of Nuevo Casa Grandes and were en route to a Juarez clinic for kidney failure treatment.

Ciudad Juarez is often called Mexico’s most dangerous city.

Since President Calderon declared war on the organized crime in 2006, between 30 and 40 thousand people have been killed in Mexico, with just over 15,000 drug-related deaths in 2010 alone.