24 April - Pavlo Lapshyn moves to Birmingham from Ukraine, after securing a work placement at software firm Delcam PLC.
27 June - A man from Walsall is arrested in connection with the explosion but is later released without charge.
12 July - Most powerful device explodes outside a mosque in Tipton. The , an hour before Ramadan worshippers begin prayers at the mosque. Police say the bomber getting the wrong time probably saved lives.
18 July - Two men, aged 25 and 22, arrested in connection with the mosque attacks across the West Midlands. A search of Lapshyn's flat reveals bomb-making equipment along with incriminating literature and data on his computer.
20 July - Lapshyn, already in custody, is arrested for the murder of Mr Saleem after police uncover incriminating evidence on the computer seized from his flat.
22 July - 22-year-old man arrested in connection with the mosque attacks is released without charge. Lapshyn, 25, is charged with the 'terrorist-related' murder of Mohammed Saleem. Police also confirm at mosques across the West Midlands.
21 October - Pavlo Lapshyn admits murdering Mr Saleem, causing an explosion near a Tipton mosque and engaging in conduct in preparation of terrorist acts between April 24 and July 18 this year. This included planting bombs near mosques in Walsall and Wolverhampton, researching locations to plant bombs and buying chemicals on the internet to make explosives.