At least six militants were killed in a clash with the police in Punjab province of Pakistan on Wednesday, an official said.Two policemen were also injured in the clash which was triggered when a police party raided a militant hideout in Okara district, Xinhua news agency quoted a senior police official as saying.The police and intelligence personnel conducted a joint operation, he said.The injured policemen were taken to a nearby hospital.Police said that during the joint operation with intelligence personnel they recovered arms and ammunition from the hideout of the militants, who are reported to be from Al-Qaeda militant group. The house was sealed for further investigation.