KARACHI - A bomb failed to explode outside the International Committee of Red Cross office at Tipu Sultan Road in the limits of Bahadurabad Police Station here on Saturday. A small blast did take place from the detonator of the homemade bomb, which was left in a trash bin outside the main gate of the ICRC in Bahadurabad area. No one was harmed but the wall and main gate of office was partially damaged. Law enforcement agencies, officials of the Bomb Disposal Squad (BDS) and ambulances of various organisations rushed to the spot. Acting City Police Chief Iqbal Mehmood while talking to the media said that the bomb could not explode otherwise it could have more dreadful consequences. He said the detonator was not properly fixed with the device as a result of which the bomb could not explode and the a small blast did take place from detonator. He added that the blast took place around 11:30 am when security guard of the Red Cross office found suspicious bag outside the gate of the office and tried to check it out and the timer device plugged with the bomb exploded earlier before the time set by the culprits. SHO Mohsin Haider said at the time of incident, only four to five people were present in the office because of holiday on Saturday. An official of the BDS said seeking anonymity that it was a homemade bomb carrying at least four kilograms explosives. The bomb also carried some four Kg nut and bolt and a washing machine timer device. He further said that for the first time terrorists had used around 2.5 inches nut and around four to five inches bolts. They also used glycerine and plastic explosives to intensify the fire after explosion. Officer said such sort of explosives were used in incidents on December 27, Ashura blast in 2009 and some other incidents. Acting police chief said two similar incidents in two days indicated the presence of a terrorist group in the city. It is pertinent to mention here that police on Friday had also found a bomb from JPMC and diffused that before explosion. Acting CCPO Iqbal Mahmood, DIG East Tahir Naveed, SSP and experts of other investigation agencies reached the spot and collected the evidence. Meanwhile police have registered an FIR No 163/11 under section 324, 427 and 3/4 Explosive Act and 7-ATA on the complaint of security guard Shamim Kiyani and started investigation into the case. AFP adds: A senior police investigator Omar Khitab told reporters, A detonator of a locally-made bomb exploded, but it failed to explode the bomb. There were no casualties or damage. Khitab said the bomb resembled the one defused by police on Friday in the residential colony of Karachis Jinnah Postgraduate Medical Centre. Provincial interior ministry spokesman Sharfuddin Memon confirmed the incident. No one has so far claimed responsibility for the botched attack.