UPDATE (8:18 p.m.): Manchester Police confirm 19 dead and as many as 50 injured in "possible terror incident."

UPDATE (7:56 p.m.): North West Counter Terror Command says it is now being treated as a "possible terror incident."

Multiple fatalities are being reported at the site of an Ariana Grande concert in Manchester in the United Kingdom.

Video from concert goers show a panicked rush for the exits. A message from the Manchester police say emergency services are responding to reports of an explosion. It says there are a number of confirmed fatalities and wounded.

The police are urging people to stay clear of the area as first responders do their work.

Ariana Grande is said to be okay.

Manchester Police Twitter