President Barack Obama and his national security advisers are considering expanding the covert US war in Pakistan far beyond the tribal areas to Balochistan, the New York Times reported. Two high-level reports on Pakistan and Afghanistan that have been forwarded to the White House in recent weeks have called for broadening the target area to reach the Taliban and other insurgent groups to a major sanctuary in and around the city of Quetta, the newspaper said on its website, citing senior administration officials. Missile strikes by Central Intelligence Agency-operated drones have until now been limited to the tribal areas, and never been extended into Baluchistan, a sprawling province, which is next to parts of Afghanistan where recent fighting has been fiercest, the newspaper website said. Some American officials say the missile strikes in the tribal areas have forced some leaders of the Taliban and al Qaeda to flee toward Quetta, making them more vulnerable, the report said. Pakistan has complained that the missile strikes violate its sovereignty. The report said a spokesman for the National Security Council had declined to provide details, saying only "We're still working hard to finalize the review on Afghanistan and Pakistan that the president requested."