The US Navy said the two pilots involved in the military plane crash near San Diego are in 'good condition' and under 24-hour medical observation.

The two Navy pilots ejected from the plane, which crashed in the San Diego Harbor shortly after 10 a.m. local time.

As the jet impacted the surface, a massive plume of smoke and water shot into the air before disappearing off the shore near Shelter Island, a neighborhood located across the bay from Naval Air Station North Island.