Six terrorism suspects were arrested Thursday in a raid which British officials said was not connected to the city's 2012 Olympic Games. Seven more Islamist suspects were picked up Friday when a random police search turned up firearms and other weapons.

Among the six detainees in the first raid was Richard Dart, an Islamist calling himself Salahuddin who was the focus of the documentary, "My Brother, The Islamist." Dart is part of a growing involvement of white British converts in alleged terrorism. Brothers Jahangir, Mohammed and Moybur Alom were among the others arrested along with as a former police community support officer. All are between the ages of 18 and 30. They were held on suspicion of plotting a terrorist attack.

The other seven were arrested after police found weapons inside one of their cars. It was impounded after a routine check in northern England on suspicion the driver had no insurance.

Neither plot targeted the Olympics, which begin in three weeks. But the events took place among heightened security around the games. British authorities have taken precautions against lone wolf terrorists, the use of vehicles and planes as weapons, and even cyber threats.