The death toll in a militant attack on a mosque in northwest Pakistan rose to 21 after an injured person died of his wounds

The death toll in a militant attack on a mosque in northwest Pakistan rose to 21 after an injured person died of his wounds, officials said on Saturday.
  
Three heavily armed Taliban militants stormed the Imamia mosque with grenades, Kalashnikovs and explosive suicide vests in Peshawar, the main city in Pakistan's restive northwest, around the time of the main Friday prayers.
  
"The death toll has now risen to 21," a senior local police official, Mian Saeed told AFP. An official at Hayatabad Medical Complex, Tauheed Zulfiqar also confirmed the new toll and said the injured person, who was in the intensive care unit, had died of his wounds early Saturday morning.
  
"Around 40 injured people are still under treatment in different hospitals," Zulfiqar added.
  
The attack came two weeks after a suicide bombing at a mosque in southern Pakistan killed 61 people.
  
The Tehreek-e-Taliban Pakistan (TTP) claimed responsibility for Friday's attack in an email statement.