The homemade explosive used by a 32-year-old suspect in a terror attack outside Liverpool Women’s Hospital was made up of ball bearings and its shrapnel had the potential to cause significant death or injury, UK police said on Friday.

The terror attack by asylum seeker Emad Al Swealmeen on Sunday ended in his own death as the taxi he used exploded with the homemade bomb.

The UK Counter-Terror Police said it remains unclear why the device exploded the way it did.