Three people have been injured, at least one critically, three lanes of northbound Interstate 5 are blocked and the Valencia Boulevard exit is closed because of a collision involving two semi-trailer trucks and a car.

The collision took place at about 11:17 a.m. today when a car became wedged between the two trucks, said Matt Levesque, inspector for Los Angeles County Fire Department. 

One of the three injured patients was transported to a trauma center in critical condition, he said.

"It was a small car to begin with," he said. "It was made real small after it was hit by the semis."