Heavily armed terrorists on Monday gunned down at least 27 policemen, including eight officers, and injured 90 others as they stormed into police training centre near here, barely a month after the brazen attack on Sri Lankan cricketers in this city. Lobbing grenades and opening indiscriminate fire, the terrorists, said to number between 10 and 16, struck the academy as trainees prepared for the morning drill, killing guards at the gate and later holed up inside with hostages. Authorities clamped curfew, called in the Army and paramilitary rangers who along with police laid a siege to the sprawling complex where an estimated 800 unarmed policemen were present. Helicopters and armoured carriers were deployed by the security forces to monitor the situation inside, which authorities described as a hostage crisis. Interior Ministry chief Rehman Malik said the suspicion in the attack was on Lashker-e-Taiba and Jaish-e Mohammad as intermittent firing and sounds of explosions continued to emanate from the centre. While Malik said the attack bore resemblance to the Mumbai terror strikes, former Foreign Minister Gohar Ayub said it "is similar to the one on the Sri Lankan team". "It is the same type of people and same style of operation," he said. Prior to the attack, which started between 7-8 a m, a series of at least five blasts were heard at the training centre at Manawan, located near the Wagah land border. The explosions were followed by an exchange of fire between the attackers and policemen that continued for over two hours. Most of the casualties occurred near the gate of the centre when the terrorists lobbed several grenades as they launched their attack and then fired indiscriminately. Deputy Inspector General (Investigation) Mushtaq Sukhera said that 850 recruits were present in the centre at the time of the attack. Policemen and Rangers, including snipers, had taken up positions on rooftops of buildings adjacent to the centre, Sukhera said. Lahore Police Commissioner Azam Suleman said 34 people have been admitted to the hospital. "I cannot say anything about the number of dead and do not want to speculate anything. It is an emergency situation right now," he said. An emergency was declared in all hospitals in Lahore and a red alert was sounded in the city. Eyewitnesses, who escaped the carnage said that militants clad in police uniforms and carrying backpacks, had entered the training centre and took up positions in several buildings and exchanged fire with the security forces. M Latif, a recruit who escaped from the centre with a dozen colleagues, said the policemen were busy training when the terrorists stormed the centre and threw grenades and opened fire. A visibly shaken Latif said many recruits, all of whom who were unarmed, were still inside the centre. Another recruit named Jehangir, who was injured, said he had seen about eight terrorists enter the centre and spray bullets at policemen. "A number of my colleagues fell as they were hit by bullets. Then blasts occurred. Everyone was running for their lives and I was hit by a bullet in my left arm," he said. Hundreds of policemen, including members of an elite anti-terrorism squad, surrounded the centre and cordoned off the nearby area. Police also fired teargas at the attackers as helicopters were used for aerial surveillance. Dramatic footage aired by TV channels showed bodies of several policemen strewn across the ground. Dozens of policemen scaled a wall to escape from within the centre. Police used armoured vehicles to bring the dead and injured out of the centre after rescue workers were unable to approach them because of the firing. Lahore has witnessed several terrorist attacks since last year, including an assault on Sri Lankan cricket team on March 3 that left eight persons dead and over 20 injured. Suicide bombers also struck at the Federal Investigation Agency office and a naval college in Lahore last year. Chronology of some major attacks in Pak Following is a chronology of some of the major terrorist attacks in Pakistan since 2007: October 18, 2007: At least 139 people were killed and nearly 400 injured in a suicide bombing in Karachi near a motorcade carrying former Pakistani Premier Benazir Bhutto when she returned to the country after eight years of self-imposed exile. December 21: At least 50 were killed in an attack on a mosque in Pakistan's northwest. December 27: A gun and suicide bomb attack kills Bhutto and more than 20 of her supporters as she leaves a party rally in Rawalpindi. February 16, 2008: Suicide car bomber attacks a PPP rally in the northwestern tribal town of Parachinar, killing 37 people. February 29: At least 44 people were killed in Mingora, the main town in the restive Swat valley. March 2: Suicide bomber kills 43 at a meeting of anti-militant tribal elders in the northwestern district of Darra Adam Khel. March 10: The Federal Investigation Agency building in Lahore attacked by suicide bombers killing 26 people. July 6: Suicide bomber kills 15 people in an attack in Islamabad during a rally to mark the first anniversary of army raid on the radical Red Mosque. August 21, 2008: Twin suicide attacks kill 57 people outside Pakistan's main arms factory in Wah. September 20: At least 60 people were killed when a suicide attacker rammed a massive truck bomb into the gates of the luxury Marriott hotel in Islamabad. March 3, 2009: Eight people, including policemen, were killed and several injured when terorrists ambushed the bus of Sri Lankan cricket team in Lahore. March 27: A suicide bomber attacks a mosque in the northwestern town of Jamrud, killing 70 people.