Great news: a terrorist plot to possibly bomb a night club and a shopping center in Great Britain has been thwarted.

But — the operation to arrest the suspects had to proceed earlier than planned after a British anti-terror chief’s blunder:

Twelve men have been arrested in the north west of England after Britain’s most senior counter-terrorism police officer sparked a security alert.

Assistant Commissioner Bob Quick said he “deeply regretted” revealing a secret document to photographers when he arrived for a briefing at No 10.

The document, clearly marked “secret”, carried an outline briefing on an ongoing counter-terrorism operation.