A suspected car bomb exploded in the Northern Irish city of Londonderry on Saturday, police said, with leading politicians alleging the blast was terror-related.

The Police Service of Northern Ireland tweeted a photograph of the scene outside a courthouse as it warned that evacuations were taking place due to a second suspect vehicle in the British province’s second city.

“Police are in attendance at the scene of an incident in Derry/Londonderry city centre,” the PSNI tweeted.

“We would ask for patience and co-operation of the public and the business community as we carry out our initial investigations.” “Bishop Street closed. Stay away. Suspected car bomb,” an earlier tweet said.

The force added on Facebook: “As far as we know no one injured.