Updated

The newly inaugurated Libyan parliament has threatened to act against warring militias who don't abide by its call for an immediate cease-fire, which it says will be supervised by the U.N.

The parliament's call late Wednesday is among its first since it convened in the eastern city of Tobruk, after violence swept through the capital, Tripoli, and Libya's second largest city of Benghazi.

In a statement obtained by The Associated Press on Thursday, parliament also made changes to an earlier constitutional declaration, giving itself more powers it said would help it rein in out-of-control militias.

Yet, the parliament's call could very well go nowhere, like several other calls for cease-fires made by the previous interim government. Militias have grown in power since the toppling of dictator Moammar Gadhafi in 2011.