Le's body was discovered Sunday, hidden in a basement wall in a medical research building. The 24-year-old graduate student in pharmacology, who had been scheduled to get married the day her remains were found, was last seen entering the building Tuesday morning.
Elsewhere in the building, bloody clothes were found hidden above tiles in a drop ceiling, investigators said.
Le's death is being investigated as a homicide, but Connecticut medical examiners released no further information beyond the identification.
A Yale professor told CNN on Monday that the building has good security and only certain people can enter, let alone access certain areas. Professor Gary Rudnick, who interviewed Le when she applied for admission to the graduate program in pharmacology, said it gives him the sense that there could be a "murderer among us."
No suspects are in custody, but investigators are questioning several people in the case, New Haven Police spokesman Joe Avery said. Watch a report about the case »
Authorities have not described the clothes that were found, nor said to whom they may have belonged. Teams of investigators at a Connecticut State Police lab worked through the weekend processing and examining the blood-stained clothes.
Thomas Kaplan, editor of the school newspaper, the Yale Daily News, said a Yale police official told the paper that the clothes were not what Le was wearing when she entered the building.
At a meeting Monday for members of the campus community, Yale officials discussed security and provided an update on the investigation. A faculty member and a student who attended the meeting told CNN that Yale officials said police have narrowed down suspects.
Security cameras captured video of Le as she entered the four-story lab building at 10 Amistad Street, about 10 blocks from the main campus, six days ago. After poring over hours of surveillance tapes, authorities said they had not found images of her leaving the building.
Rudnick described security in the building as "very good." It had restricted access, and simply having a Yale ID card was not enough to get in, he said. Within the building, one had to have special access to enter certain areas, he said.
Le was to be married Sunday on New York's Long Island to Jonathan Widawsky, a graduate student at Columbia University.
Investigators searched a waste facility Sunday that normally handles garbage from the Yale lab, said William Reiner of the
Haven office. The search took place at the Resources Recovery Authority landfill in Hartford, near New Haven.
"In a situation like this, it's common for us to follow the trash," Reiner said.
Yale University President Richard Levin, in a statement to the campus community, said, "Our hearts go out to Annie Le's family, fiancé and friends ... "
The school sent out information Monday from Vice President and Secretary Linda Lorimer saying, "We are cooperating in all possible ways with the police to ensure they find every shred of physical evidence in the building so they can solve this horrible crime without delay. When the building does reopen, there will be extra security both inside and outside the facility for the foreseeable future."
Lorimer added, "To augment the substantial security already in place at the Medical School, Yale moved last week to increase security and police patrols on the streets in the area and to add a new bicycle patrol. Yale also added security personnel inside Sterling Hall of Medicine, where Annie Le had her lab."
The school has made grief counselors available, as well as a 24-hour helpline number. "The university chaplain's office is available to offer pastoral counseling and can put members of the community in contact with those of many faiths and denominations," the message from Lorimer said.
Le, a resident of Placerville, California, seemed to have been well aware of the risks of crime in a university town.
In February, she compared crime and safety at Yale to other Ivy League schools for a piece for B magazine, published by the
Among the tips she offered: Keep a minimum amount on your person.
When she walked over to the research building on Tuesday, she left her purse, credit cards and cell phone in her office