There is no evidence that anyone was trapped inside a hotel in the Texas Medical Center when it was demolished in a controlled explosion last month, police said Thursday.

The Houston Police Department opened an investigation into the possibility someone might have been inside The Crowne Plaza Hotel at 6701 South Main after receiving an amateur video apparently showing the figure of a person running across the hotel's eighth floor just prior to its implosion on Nov. 11.

Cherry Demolition Co. immediately stopped work on the site to cooperate with HPD's investigation, police said.

Employees painstakingly removed debris while investigators and cadaver dogs searched for any sign of human remains, they said.

HPD homicide investigators examined more than 100 photographs taken before and during the implosion that clearly showed no one was in the building at the time, police said.

The entire site has now been cleared and no human remains were found, police said.

At one point, cadaver dogs responded to material thought to be blood, but investigators determined the blood came from a Cherry employee injured before the demolition, they said.