In Varanasi, investigations are on by Forensic Experts who arrived from Delhi to examine the nature of explosive material used in Tuesday's bomb blast. A girl child wad killed and 38 persons were injured in the explosion. The State Addl. Director General Police, Law and Order, Mr. Brij Lal said, search continues to recover vital clues including any circuit of the bomb which could indicate the method of detonation used. He said a team from the Forensic Laboratory in Agra is already on the job and a report in expected by this evening. The Blast site at the Sheetla Ghat remains virtually sealed. Intelligence Bureau Forensic Experts are making frequent visits to gather samples from the site. The National Investigating Agency and Special Task Force of the state are also camping in Varanasi hunting for clues into the bomb blast. Divers are also being used to search for detonators of the improvised explosive device that could have fallen into the river Ganga following the blast. The Anti Terrorist Squad (ATS) of the state police has detained three locals working as daily-wage laborers and a mason for questioning. The trio was reportedly engaged recently for some repair works of the ghats carried out a fortnight ago. State police has also asked Gujarat police's forensic department to help into the investigation. A team of forensic experts from Gujarat police have reached Varanasi. Chief Minister Mayawati has directed the police to provide elaborate security arrangements for sensitive religious and tourist places across the state. AIR correspondent reports Intelligence agencies are examining the telephone calls just before and after the blast and also studying the movement of suspects close to terrorist’s organisations.AIR correspondent Sunil Shukla reports from Lucknow that in Varanasi Anti Terrorist Squad of state police has detained three locals working as daily-wage laborers and a mason for questioning. The trio was reportedly engaged recently for some repair works of the ghats carried out a fortnight ago. State police has also invited a deputy director general rank officer of Gujarat police's forensic department to help into the investigation and a team of forensic experts from Gujarat police reached at Varanasi. Intelligence agencies are examining the telephone calls just before and after the blast and also studying the movement of suspects close to terrorists’ organisations. Meanwhile state Chief Minister Mayawati has directed for elaborate security arrangements for sensitive religious and tourist places across the state. The chief Minister has asked the Director General of Police for preparing a detail security plan for sensitive places. She has said security arrangements made at sensitive places must be reviewed with district officials through video conferencing and during conferencing all senior civil and police officials must be present.