Bloody clothing and other evidence of a crime scene have been found inside a Yale building where a 24-year-old graduate student vanished days before her wedding, sources said. The evidence was reportedly found inside ceiling tiles.

During a press conference Saturday afternoon, FBI officials made clear that Annie Le's body has not been recovered. Investigators were spotted the same day questioning a man outside the lab where Le was last spotted Tuesday morning.

On Friday, police questioned a professor in connection with the case. Le was supposed to attend the professors class on Tuesday afternoon - but it was abruptly canceled and the California native was discovered missing hours later.

Authorities recovered Le's purse, cell phone, credit cars and money in her office.

Investigators said they were reviewing footage from nearly 75 cameras on and around the building where Le was last spotted. So far, they claim to have not seen footage of her leaving the building.

Yale spokesman Tom Conroy said investigators are also planning to examine blueprints of the building to ensure they do not miss places in the search and are also checking Le's computer to sift through her e-mails.

Conroy said there continues to be no evidence of foul play. Yale announced a $10,000 reward for help finding Le.

Her college roommate told authorities she last saw Le Tuesday morning.

Debbie Apuzzo, who works in the pharmacology department, described Le as a energetic and conscientious person. She said Le was looking forward to getting married.

The nuptials between Le and husband-to-be Jonathan Widawsky were supposed to take place at the North Ritz Club in Syosset on Sunday. Employees at the club say the wedding was canceled by family members on Friday.

According to police, Widawsky, a Columbia University graduate student, is not a suspect and is assisting with the investigation.

Le, who is 4-foot-11 and weights 90 pounds, is of Asian decent, has brown hair and brown eyes. The California-native received her undergraduate degree two years ago in bioscience from the University of Rochester in New York.

Anyone with information on Le's whereabouts is asked to contact the Yale Police Department at 203-432-4400.