MANILA (Reuters) - Police killed at least 28 people overnight in a crackdown in the Philippines capital Manila, authorities said on Thursday, a second night of heavy bloodshed this week in an intensification of President Rodrigo Duterte's fierce war on drugs and crime.

The killings across Manila followed 32 deaths in police raids on Monday night in Bulacan province, which borders the capital. Together, they mark the deadliest period of a drugs-focused crackdown that has killed thousands of Filipinos, and caused international alarm, since Duterte took office over a year ago.