A number of fire crews have been called to the Royal Free hospital in Hampstead following reports of a ward filling with smoke.
Crews were called to the Rowland Hill site that is know as a major teaching hospital just before 12pm on Saturday morning after an automatic fire alarm was sounding and staff on the 8th floor of the hospital estate reported that the ward was filling with smoke.
It is unclear if a full hospital evacuation has been ordered.
A number of fire fighters wearing breathing apparatus have been seen entering the hospital to carry out an investigation to locate the cause of the smoke.
More to follow