Bomb Kills 2 at Train Station in Lahore, Pakistan LAHORE, Pakistan - A bomb exploded inside the busiest railway station in this eastern Pakistani city late Tuesday afternoon, killing at least two people and injuring 27, police officials said. The blast ripped through the waiting area of Business Express, a new luxury train service linking Lahore to the port city of Karachi. A train carrying hundreds of people, the Awami Express, had just pulled in when the bomb went off, causing panic throughout the station. A security guard was among two people immediately killed; several others were critically injured and taken to a hospital. The Lahore police chief, Aslam Tareen, said that a device containing 13 to 18 pounds of explosive had been planted in a bag left inside the waiting area. It was the first attack in Lahore, Pakistan's cultural capital, since February 2011, when an explosion ripped through a Sufi shrine. Mr. Tareen said that early investigations indicated a militant group was behind Tuesday's blast, but he declined to specify which one. Pakistan's popular news channel Geo Television later said that the banned Lashkar-e-Baluchistan, or Army of Baluchistan, had claimed responsibility for the attack. Baluchistan, the largest province of Pakistan, is facing an insurgency from Baluch groups that blame the government for usurping their rights. Lashkar-e-Baluchistan, in a statement reported by Geo, said that the blast was in response to killings in Baluchistan and Karachi. It warned of more attacks in the near future in Pakistan's capital, Islamabad, and its twin city Rawalpindi, the garrison capital of the country. After the Lahore blast, the Interior Ministry reissued a dispatch to the Karachi police warning them to be at high alert because intelligence reports indicate that Pakistani Taliban militants may try to strike sensitive security places in coming days. Attacks by militants on the railway network are rare in Pakistan. The Lahore station, is near a major bus station and the police headquarters, is one of the busiest locations in the city. After the attack, all entrances were sealed off as rescuers tended to the dead and wounded. The police said that at least five of the injured, including several women, were critically wounded. Shahzad Aslam Siddiqui, a senior Pakistan Railways security official, said the waiting room was partially damaged by the blast, which was detonated by a timer. Business Express is part of a new public-private partnership aimed at reviving the flagging fortunes of Pakistan Railways, the ailing state railway company, which has been plagued by corruption and labor unrest in recent years. "I was afraid and panicked," Muhammad Aslam, a passenger on the Awami Express train, said in an interview after the attack. I have been traveling by train for 10 years and have never heard such a noise. Another passenger, Ikhlaq Hussain, blamed loose security at the station. The Lahore police, he said, had dropped their guard over the past year because of the lull in militant violence. Waqar Gillani reported from Lahore, and Declan Walsh from Islamabad, Pakistan.