One person is dead after a fire broke out on the 12th floor of a Market Street apartment building Thursday evening.

The "serious" fire broke out at 155 Market St., between Hess Street North and Caroline Street North, around 5:15 p.m., according to the Hamilton Fire Department Twitter feed.

The call was upgraded to a multiple alarm fire.

Hamilton police Staff Sgt. Oliver Mann said smoke filled the hallway of the building.

The Ontario Fire Marshal has been called to attend the scene, the fire department tweeted.

Mann said a police fire investigator would be conducting an investigation alongside the OFM.

The fire on the 12th floor of 155 Market Street has been extinguished. There is one confirmed fatality as a result of this fire. The Ontario Fire Marshal has been requested to attend. Residents will be allowed back into the building shortly.

— Hamilton Fire Dept (@HamiltonFireDep) November 29, 2018

Residents were expected to be allowed back in the downtown apartment building shortly, according to a tweet from the fire department just after 6 p.m.

By 7:30 p.m., the scene had been cleared except for police.