<sod >- A gunman who shot two police officers, killing one of them, held a SWAT team at bay on Saturday as he barricaded himself inside an apartment and showed no signs of giving up more than 15 hours after the standoff began, authorities said.< eod>< sod > LOS ANGELES - A gunman who shot two California police officers, killing one of them, was arrested Saturday after barricading himself in an apartment and holding a SWAT team at bay for more than 15 hours, authorities said.< eod>