Two Eastern European men have been arrested in connection with the explosion near Aisha Mosque in Walsall last month.
The 25-year-old and 22-year-old were arrested just before 3pm today.
Police are searching an area of Talbot Way in Small Heath and as a precaution homes have been evacuated.
More top news
The British Hedgehog Preservation Society are urging people to think of the wildlife around them as Halloween and bonfire night approaches.
A driver has been caught on camera tailgating an ambulance carrying a sick child to hospital.
West Midlands Ambulance Service said the possibility of multiple fatalities had been "enormous".