WASHINGTON - Osama bin Laden was cornered in the Afghan mountains in 2001 but the United States did not deploy massive force to capture or kill the Al-Qaeda leader, a Senate report says. The Senate Foreign Relations Committee report, to be formally released Monday, blames former Defence Secretary Donald Rumsfeld and General Tommy Franks, the former American commander, for not sending more US troops after Osama bin Laden. The failure to finish the job, the report said, represents a lost opportunity that forever altered the course of the conflict in Afghanistan and the future of international terrorism, leaving the American people more vulnerable to terrorism, laying the foundation for todays protracted Afghan insurgency and inflaming the internal strife now. The report said emphatically Osama bin Laden was in a complex of caves and tunnels in Tora Bora in December 2001 before escaping to Pakistan. But the report said the US command severely limited its capacity to get to the al-Qaeda leader. The command relied on air strikes, American Special Operations, CIA officers and untrained Afghan militants to go after bin Laden and on loosely organized Pakistani corps to block his escape, the report said. The vast array of American military power, from sniper teams to the most mobile divisions of the Marine Corps and the Army, was kept on the sidelines, the report said. The report cites experts saying bin Laden arrived in Tora Bora in November 2001, accompanied by 1,000 to 1,500 fighters and bodyguards. The decisions that opened the door for his escape to Pakistan allowed bin Laden to emerge as a potent symbolic figure who continues to attract a steady flow of money and inspire fanatics worldwide, the report said. The report, Tora Bora Revisited: How We Failed to Get bin Laden and Why it Matters Today, was prepared at the request of Senator John Kerry, a Democrat who is the Chairman of the Foreign Relations Committee, by the committees staff. In a letter accompanying the report, Kerry said it examines the consequences of the failure to eliminate Osama and other extremist leaders in the hope that we can learn from the mistakes of the past. The reports release is to come a day before President Barack Obama makes an announcement on increasing troop levels in Afghanistan. White House aides have reportedly said Obama would announce a troop increase of up to 30,000 US soldiers, in addition to 68,000 already in Afghanistan. Monitoring Desk adds: US President Obama got some political cover Sunday for his upcoming announcement on sending more troops to Afghanistan, reports CNN. The report blames the Bush administration for failing to capture or kill Osama bin Laden when the Al-Qaeda leader was cornered in Afghanistans Tora Bora mountain region in December 2001. The report says the situation in Afghanistan presented greater problems today because of the failure to nab bin Laden eight years ago. Osama had written his will, apparently sensing he was trapped, but the lack of sufficient forces to close in for the kill allowed him to escape to tribal areas in Pakistan, according to the report. Our inability to finish the job in late 2001 has contributed to a conflict today that endangers not just our troops and those of our allies, but the stability of a volatile and vital region, Kerry, D-Massachusetts, wrote in a letter of transmittal for the report. When Kerry was the Democratic presidential nominee in 2004, he argued that the Bush administration botched the pursuit of Osama and that then-President George W Bush took his eye off the ball in Afghanistan to invade Iraq. Sen Richard Lugar, the ranking Republican on the Foreign Relations committee, told CNNs State of the Union that the new report does serve as a convenient way for, perhaps, Democrats to say once again, theres another failing of the past administration and that all the problems have accumulated. Democratic Sen Jack Reed of Rhode Island, responding to Lugars comment, told CNN that Obama faced the culmination of decisions that were made eight years earlier, which he said made the situation much more difficult today.