Lebanese troops patrolled Beirut on Sunday after Hezbollah fighters pulled back from areas they had seized in deadly gunbattles with supporters of the U.S.-backed government. Hezbollah, a political group backed by Iran and Syria that has a guerrilla army, said on Saturday it was ending its armed presence in the capital after the army -- seen as a neutral player -- overturned government measures against the group. In the worst internal fighting since Lebanon's 1975-90 civil war, Hezbollah had taken over much of Beirut after its fighters routed gunmen loyal to the anti-Damascus governing coalition. The four days of fighting, in which 37 people were killed, erupted after the government said it was taking action against Hezbollah's military communications network and sacked the head of security at Beirut airport, who was close to the group. Hundreds of troops backed by armored vehicles set up roadblocks and took up positions on streets in the mainly Muslim part of the capital.