An early morning explosion in the Texas A&M Chemistry Building has prompted further investigation into the incident.

The blast occurred at approximately 3 a.m. in a third floor laboratory of the building, said Bart Humphreys, the College Station Fire Department (CSFD) public information officer. No one was injured, he said.

Officials have not determined the cause of the explosion.

"We know there were several processes going on in the lab that were usually put away in the evening," Humphreys said. "We will look into that, but as of now the cause is undetermined."

Two people had been sent in to investigate the laboratory and reported extensive damage to the area, Humphreys said.

"There are reports of vapors still present in the air on the third floor," he said. "We don't want to expose our people to dangerous chemicals and of course we don't want to expose the public either."

A graduate student worker who asked to remain anonymous said students heard the explosion had caused a large cylinder, possibly containing nitrogen, to leave a hole in the laboratory ceiling.

"In the lab there is a small room with instruments," the student said. "We heard another cylinder broke through the wall and made a pretty large hole."

Low water pressure levels may have prompted officials to check the laboratory, the student said.

"We had heard they found out the water pressure in that area was not good," the student said. "They may have noticed it was abnormal and gone to check the water or air pipes."

The student said they did not believe a student was present in the building at the time of the explosion.

"There would not be a student in the building at that time," the student said. "A safety person might have been there, but they would be down on the first floor and the explosion was up on the third floor."

The building is expected to reopen Friday, with access restricted to the affected areas of the building, according to a press release issued by the University.