A blast was heard in Baghdad late on Wednesday coming from the fortified Green Zone, which houses government buildings and foreign embassies in the Iraqi capital. The cause was not immediately clear, witnesses told <em>Reuters.</em> An Iraqi soldier stationed in the Green Zone confirmed the noise originated from the zone but gave no other details. The last attack on the Green Zone was on September 24, when two rockets landed near the US embassy in the compound. The rockets were found to have been fired from an area in southern Baghdad where Iraqi paramilitary forces close to Iran hold sway. Prime Minister Adel Abdul Mahdi on Wednesday declared a curfew in Baghdad until further notice after at least nine people were killed and more than 400 injured during two days of nationwide anti-government protests.