(Adds end of the alarm)
LONDON, June 24 (Reuters) - The British parliament was briefly evacuated on Monday due to a fire alert, a Reuters witness said.
A message over the PA system urged people to leave the building. Lawmakers were also asked to leave the area as a loud alarm sounded.
The alarm ended around 20 minutes later and lawmakers, staff and journalists were allowed back into the Palace of Westminster. (Reporting by William James, writing by Kate Holton; editing by Guy Faulconbridge)