An early morning anti-terrorism raid on a notorious Finsbury Park mosque here Monday showed how the rules of the game have changed in Britain’s struggle with Islamic extremism. Illuminated by two police helicopters, about 150 officers in riot gear stormed the mosque at 2 a.m. using battering rams and ladders. They arrested seven suspects in the investigation of a terrorist network involved in the production of a deadly poison and the slaying of a police detective. A search of the mosque turned up canisters of CS tear gas, a stun gun and an imitation firearm along with potentially significant documents, police said. The raid also sent an emphatic message: Police have decided to get tough with a house of worship that, according to European law enforcement, has openly recruited Islamic extremists and supported terrorist acts. Full Story