May 21: NSG reports similarities with the Malegaon blasts on Sept 8, 2006
May 22: SIM card in failed bomb's mobile phone timer traced to a shop in Jharkhand, bought using the ID of Babulal Yadav. But Yadav is unaware of purchase
May 23: Police turn to narcoanalysis of Sameer Sheikh, an alleged LeT operative, who claims to have transported men from Bangladesh to Hyderabad
May 25: Hyderabad police arrest Shoaib Jagirdar, a 52-year-old butcher from Jalna in Maharashtra. Police say he visited Hyderabad with Sheikh
June 7: Sheikh taken into custody by the Hyderabad police, the only one formally arrested for the blasts
June 15: Abdul Sattar, 27, a mechanic is arrested by the Hyderabad police
July 26: CBI issues lookout for two persons believed to have bought the SIM cards; a Noida yoga teacher claims his photo used