A husband and wife have been convicted of planning a large-scale bombing of civilian targets in London to mark the 10th anniversary of the July 7, 2005 attacks on the city’s transit system.

Mohammed Rehman, 25, and his wife Sana Ahmed Khan, 24, were found guilty Tuesday at the Old Bailey court.

Prosecutors said Rehman was only a few days away from finishing work on a bomb capable of causing mass casualties. Authorities found a video of him detonating a smaller device in his backyard.

They said he had used the name Silent Bomber to ask Twitter followers to help him choose a target. He was also convicted of possessing an article to be used for terrorist purposes.

The July 7 attacks killed 52 civilians.

(AP)