ISLAMABAD (Reuters) Taliban insurgents had planned to use five Americans detained in Pakistan, who had contacted the militant group through the Internet, to carry out attacks inside the US ally, a police official said on Saturday. Usman Anwar, police chief in Sargodha, where the men were arrested this month, said emails revealed plans for the young men from Virginia to travel to a Pakistani nuclear power plant. We believe that they were supposed to be used inside Pakistan, Anwar told Reuters by telephone. In their last email to the Taliban, we found they mentioned the Chashma Nuclear Plant and thats why they were going to Mianwali. Anwar declined to give details of the case because police were still interrogating the suspects. Washington is pressuring Pakistan to root out militants in lawless tribal areas who cross the border to attack Western forces in Afghanistan. But the matter is politically sensitive. Pilotless US drone aircraft attacks on suspected militants on Pakistani soil have infuriated many Pakistanis. Some analysts say the case of the Americans reflects a new strategy by militants to try to avoid tighter security measures by forming networks on the Internet. The men - two are of Pakistani origin, one of Egyptian, one of Yemeni and one of Eritrean - could face terrorism charges. They were found with maps and had intended to travel through northwest Pakistan to an Al-Qaeda and Taliban militant stronghold, officials said.