Rome, December 31 - Eighteen people were wounded when a double-decker coach carrying 60 passengers swerved and capsized on the A1 highway early on Thursday. Fire fighters extracted 18 people from the wreck, three of them with serious injuries. The rest of the passengers were transferred to another coach. The bus was on its way north on the Naples-Milan motorway when it crashed between the Ferentino and Anagni exits. The highway going north was shut down for a while as a result. The causes of the crash - which occurred around 4:30 am local time - are still undetermined, officials said.