Four people were critically injured today when a vehicle crashed into a tree in the Lake Balboa area of the San Fernando Valley near Encino, authorities said. | Gallery: More crash photos

Paramedics were sent to the 6500 block of Balboa Boulevard shortly before 8 a.m., said Brian Humphrey of the Los Angeles Fire Department.

Firefighters freed at least two people from the wreckage. The injured were described as two young men and two male teens, Humphrey said. The circumstances of the crash were under investigation.