A fourth arrest has been made in connection with at least one robbery at the University of Houston.

Sue Ortiz has been accused of using credit cards stolen during a robbery on campus on Sept. 19. She has been charged with credit card abuse.

Three other people have been arrested in connection with that robbery. UH police chief Ceaser Moore said Ricardo Tangarife attacked a student at gunpoint in a campus parking lot. He has been charged with aggravated robbery.

"He got out of the vehicle and approached a student with a gun, and demanded their money and cellphone," Moore said. "He got back in the vehicle with a driver who we have not identified, and he drives to Memorial City Mall. And within 45 minutes of the robbery, he is making charges at stores."

Ladarian Dwayne Bimage, 21, has been charged with aggravated robbery.

Anthony Theus, 20, has been charged with credit/debit card abuse. He is accused of working at Sheikh Shoes at Memorial City Mall and knowingly allowed purchases with stolen credit cards.

More than 42,000 students are enrolled at the University of Houston.