A suicide bomber blew himself up as he tried to enter a house owned by a member of Pakistan's ruling coalition Thursday, killing four people but missing the politician, officials said. The bombing happened in the northwestern town of Charsadda, outside a separate guest room of the house belonging to Asfandyar Wali Khan, head of the Awami National Party (ANP), they said. The politician was not hurt in the attack, which occurred as he was visiting a guest in the building as part of celebrations for the Muslim festival of Eid-al-Fitr, police and party officials said. "Four people were killed in the suicide blats. The target was Asfandyar Wali but he is safe," Mian Iftikhar, the information minister for North West Frontier Province, told local television. Provincial police chief Malik Naveed said that guards shot the bomber before he blew himself up. "The suicide bomber tried to pass from the security scanner avoiding a physical search. Two security guards grabbed him but he tried to get away," Naveed said. "Then he was shot and as soon as he fell on the ground he blew himself up.". He added: "We had made strict security arrangements and that is why the attacker could not cause more damage or casualties."A senior party member said that one of Asfandyar Wali Khan's armed guards was killed in the latest attack. "The incident happened outside the hujra (guest house). One suicide bomber was trying to enter, he was stopped but the bomber blasted himself. The guard was killed," the party member, Haji Adeel, told Dawn television.