MOSUL (Reuters) - Bombs in Baghdad and northern Iraq killed at least 41 people on Thursday, police said, underscoring doubts about local forces ability to keep Iraqis safe after US troops pulled out of city centres. Two suicide bombings in Tal Afar, a town in volatile Nineveh province that is mainly home to minority Turkmen of the Shias, killed 34 people and wounded 60, police said. One suicide bomber detonated an explosive vest in the historic centre of the town, 420 km northwest of Baghdad, followed by another suicide attack just as people responded to the first blast. In Baghdad, seven people were killed and 20 were wounded by two bomb blasts in a market in Sadr City. Police said both bombs were placed among rubbish piles in the popular Sadr City market. Reuters television footage showed the blood-stained interior of a minivan damaged in the attack. Mosul remains a city under siege, its buildings pockmarked by shrapnel from explosions and its streets littered with rubble. On Wednesday evening, two car bombs exploded within minutes of each other in Mosul, killing 14 people and wounding 33.