BEIRUT: Hezbollah gunmen took control of large areas of Beirut on Friday in a third day of fighting between the pro-Iranian group and fighters loyal to the U.S.-backed governing coalition. Security sources said at least 10 people had been killed and 20 wounded. The thud of exploding grenades and crackle of automatic gunfire echoed overnight in the worst internal strife since the 1975-90 civil war. Gunmen loyal to Hezbollah forced the pro-government television off the air on Friday, said a senior official at the Beirut station. The security sources said Hezbollah and fighters from the allied Amal movement -- both Shi''ite groups -- had overrun offices of Hariri''s Future group across the predominantly Muslim western half of Beirut. Gunmen had also taken over the offices of Hariri''s newspaper, witnesses said. Smoke billowed from the building''s windows.