LONDON – A 22-year-old man has pleaded guilty to attempting a suicide bomb attack on a family restaurant.

Nicky Reilly pleaded guilty at a London court Wednesday to attempted murder and engaging in preparation for terrorism by researching how to make bombs.

Reilly is a convert to Islam who police say has a history of mental illness. He was arrested shortly after a blast rattled a family restaurant in the southwest English city of Exeter 200 miles (320 kilometers) west of London on May 22.

Witnesses reported seeing Reilly enter the restaurant's bathroom shortly before the blast. A photo released by police showed a bloody-faced Reilly being approached by officers shortly afterward. He was the only person wounded in the blast.