报警

报警	bào jǐng	to sound an alarm / to report sth to the police
报	bào	to report; to inform; to announce / to respond; to reply / to sign up for; to register for (abbr. for 报名) / to reward; to recompense / to take revenge; to retaliate / newspaper / periodical; journal / bulletin / telegram
警	jǐng	to alert / to warn / police