Click to watch raw video of the implosion | Vicente Arenas' 10 p.m. on the home video| Chau Nguyen's 5 p.m. report

New information is surfacing as crews search the rubble of a Medical Center Hotel imploded this weekend.

Sniffing dogs that detected the scent of human blood Wednesday returned with their owners Thursday.

They’re hoping to solve the mystery of whether someone was inside the Crowne Plaza Hotel when it imploded Sunday.

“I’m not saying it’s a person in there, but they went to the exact same spot as yesterday and they hit hard on it,” said Jena Bickel the canine contractor.

The owners have no doubt the dogs are sensing human blood, but officials say the blood could simply have come from a workman’s minor cut.

Amateur video showed a door closing just before the implosion.

Thursday, 11 News talked to the Oklahoma-based company in charge of the demolition.

It showed off seismic photographs that were shot in half second increments.

Vicente Arenas

Workers began the search on Wednesday and continued on Thursday.

The contractor is convinced the pictures tell it all.

“This is, to me, proof documentation,” said Jim Redyke with Dykon Explosives. “In my opinion, there’s nothing there.”

Still, authorities want to make absolutely sure.

The dogs will once again return Friday as the cranes dig deeper into the rubble.