A significant arms cache, including a sniper rifle, a silencer and tracer rounds linked to the banned terrorist group al-Muhajiroun have been found in Coventry, the Observer can reveal.

Officers from the West Midlands Counter Terrorism Unit and MI5 are investigating the weapons haul, which also includes a shotgun and 200 rounds of ammunition, following raids at several addresses in the city.

A statement from West Midlands Police, which assists the regional counter-terrorism unit, said: “Firearms and ammunition were recovered during the raids and a police investigation is ongoing.” Four men have been arrested, one of whom has links to the al-Muhajiroun network, according to sources. The group, active in the UK since the mid-1980s, disappeared after the July 2005 attacks on London, but maintained a presence under various different names. It was eventually banned in 2009 under legislation outlawing “glorification” of terrorism.

Read more: The Guardian