By Sarah Toms BBC News, Manila

Protesters have been questioning the state of emergency

They spent the night in their offices and said they would remain there until the police produce warrants.

Police filed charges of rebellion against 16 people on Monday, including the five lawmakers and soldiers.

They are accused of being involved in a plot to overthrow the Philippines President Gloria Arroyo.

The state prosecutor said the five lawmakers had lost their immunity as members of Congress, because they were accused of a serious offence punishable by more than six years in prison.

Another suspect, whose whereabouts are unknown, is Gregorio Honasan, a former senator linked to more than a dozen coup attempts.

Emergency rule challenge

Police have asked the Department of Justice to also file charges against 51 communist and rebel leaders for previous acts of rebellion.

The series of arrests are being carried out under the president's emergency rule, invoked on Friday after the military said it had foiled the conspiracy.

The order expands the powers of the military and police, bans rallies and permits arrests without warrants.

The Supreme Court said it would start debating petitions questioning the emergency declaration next week.

Lawyers and other citizens filed two petitions on Monday urging the Supreme Court to issue a temporary restraining order against the proclamation, calling it a grave abuse of discretion.