As the Pakistan army fights the Taliban in Swat, Taliban militants erode freedom in Peshawar.

Pakistani authorities increased security throughout the capital Friday after this week's deadly bombings in Lahore and Peshawar and a threat by the Taliban to carry out further attacks.

All vehicles must go through checkpoints before entering Islamabad, the city's deputy police inspector general Bin Yamin told CNN. Three people have been arrested in Islamabad in connection with the current threats, he said.

The Pakistani Taliban claimed responsibility for Wednesday's suicide attack that killed 27 people in Lahore. It also threatened to continue attacking cities in Pakistan until the military ends its operations against Taliban militants in the country's northwest.