US President Barack Obama has said that Pakistan must cooperate fully with the United States to go after and wipe out the Al-Qaeda. Speaking to the CBS channel, Obama termed the tribal territories between Afghanistan and Pakistan as the epicenter of violent extremism directed against the West and the United States and more cooperation was needed from Pakistan to eradicate the problem. Obama's comments came as reports emerged that a senior Al-Qaida operations planner was killed in an American missile strike this week in western Pakistan. US counter-terrorism officials said the operative identified as Saleh al-Somali was responsible for the terror group's operations outside the Afghanistan-Pakistan region and also believed to have been involved in plotting attacks against the United States and Europe.