BBC reports at least 20 dead in Manchester Arena explosion

According to some media outlets, including BBC, an explosion at the end of an Ariana Grande concert in the Manchester Arena has claimed the life of at least 20 people. 

Manchester Police has also confirmed multiple fatalities and injuries. At this stage, there are no credible reports of a cause.

Some speculations point towards a terrorist attack, while other sources note that a transformer near the roof blew up landing hot sparks and metal fragments onto crowd.