HOUSTON -

The FBI is investigating the robbery and theft of an armored vehicle on the University of Houston Campus.

Investigators said the robbery happened just before 8 a.m. and involved an unknown number of suspects who stole an armored truck as it made a pick up in front of the University Center. 

Witnesses told Local 2 the driver of the armored vehicle was held at gunpoint and ordered out of the vehicle.

Emilliano Garcia was working nearby and said the female driver was seven or eight months pregnant.

“She told me they put the gun to her head and told her to get out of the vehicle. She said she just listened and got out,” said Garcia.

Witnesses say the second guard was filling up an ATM at the time of the robbery and ran after the suspects, firing at them as they drove away. According to the FBI, it is unknown if the suspect was hit.

“We just thought it was a wreck. And then he just kept going and then we saw the guard run off after him,” said witness Christian McGhee.

The armored truck was found in a parking garage on campus. Some money was missing from the truck.

The FBI said another "vehicle of interest" was discovered at Planned Parenthood in the 4600 block of the Gulf Freeway.

No one was injured, according to university police.

The FBI says they only have a description of one of the suspects. The suspect is described as a black male around 5 feet 7 inches and 175 pounds.

Surveillance videos are being reviewed for more information.