The Federal Capital Territory Fire Service personnel was able to contain the fire.
The incident attracted a large crowd at the busy Garki 2 in the Nigerian capital.
A security officer who pleaded anonymity, told NAN that the fire started at about 8:40 a.m.
The incident was the fifth fire incident in six months at key Federal Government offices.
On April 17, a part of the Independent National Electoral Commission (INEC) went up in flames.
Nine days earlier, some offices at the Accountant General’s office was burnt.
Just two days before, there was a similar outbreak at the Corporate Affairs Commission (CAC).
Last October, fire engulfed a part of the Federal Inland Revenue Service (FIRS).
All incidents occurred in Abuja, Nigeria’s capital.
But the government has failed to probe the causes.
Officials usually give assurances that sensitive documents remained intact.
AFRICA TODAY NEWS, NEW YORK