from the LA Times:
Los Angeles police used a water cannon early Sunday to enter a South L.A. home and arrest a domestic violence suspect after a five-hour standoff.
The incident started about 11 p.m. Saturday when a woman called police and reported that her boyfriend had pulled a gun on her while they were walking on a sidewalk near his home at 60th Street and Grand Avenue.
A SWAT team was called when the man ran into the home and refused to come out, said Sgt. Alex Ortiz at the Newton Station. He was arrested at 5:30 a.m., after the officers gained entry using the water cannon.
The man, who was not identified, was booked on suspicion of assault with a deadly weapon. The woman was not in the home during the standoff and was uninjured, police said
-- Carla Rivera
http://latimesblogs.latimes.com/lanow/2010/11/los-angeles-police-used-a-water-cannon-to-enter-a-south-los-angeles-home-and-arrest-a-domestic-violence-suspect-after-a-five.html