At least 42 people have been killed and more than 500 wounded after twin car bombs exploded outside mosques in the northern Lebanese city of Tripoli, according to the health ministry.<br /><br />The blasts went off near mosques in the predominantly Sunni city on Friday, when mosques were packed with worshippers for the Friday noon prayer.<br /><br />Al Jazeera's Zeina Khodr reports from Tripoli.