Participants in a rehearsal for President-elect Joe Biden’s inauguration were evacuated from the West Front of the Capitol on orders of security officials after a fire in a homeless encampment, officials said.

Those who had gathered for a walk-through, including a military band, were directed to head indoors and moved in the directed of a secure location inside the Capitol complex.

People involved in the rehearsal said security officials yelled “this is not a drill.”

Four law enforcement officials told The Associated Press there had been a blaze several blocks over and the rehearsal was evacuated in an abundance of caution.

The Capitol complex and surrounding areas have been locked down after a riot there Jan. 6.