MALIBU, Calif. (KABC) -- A teenage girl was killed in a head-on collision in Malibu, prompting all lanes of Pacific Coast Highway to close for several hours Friday morning.The two-vehicle crash happened near Tuna Canyon Road around 6 a.m., according to Caltrans.PCH reopened between Tuna Canyon Road and Topanga Canyon Boulevard just before noon, California Highway Patrol said.AIR7 HD was over the scene around 7:30 a.m., where both vehicles sustained significant damage.The cause of the crash remains under investigation.