Reports of smoke in a Center City hotel forced hundreds of people outside in the dark around 4:30 a.m. Wednesday.
Guests stood outside the Sheraton Philadelphia Downtown Hotel at 201 N. 17th St. while firefighters investigated smoke coming from the building's basement, according to officials.
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An ambulance transported two people to Hahnemann University Hospital, but it is unclear why.
Initial reports indicate an electrical problem may have caused the smoke.
Evacuations of the 757-room hotel, which sits next to Logan Square, took more than ninety minutes after fire crews arrived on the scene.
A Sheraton representative said it will be several hours before guests are allowed to return to their rooms.
The hotel is offering breakfast to those set to attend a 10 a.m. meeting at the hotel as part of the 69th Biennial National Association of Letter Carriers Convention.