TRIPOLI (Reuters) - At least 57 bodies have been washed ashore after two migrant boats sank in the Mediterranean off different towns in western Libya, a coast guard officer and an aid worker said on Tuesday. There was an argument as the boat was sinking but the man in charge refused to stop, he said. Eleven bodies, including that of a child, were recovered off Qarabulli in eastern Tripoli, said coast guard officer Fathi al-Zayani. The aid worker said more bodies were expected to be washed up in coming days. Italy has rescued 47 boats carrying around 1,600 migrants in the central Mediterranean sea in the last two days and brought them ashore to the island of Lampedusa.