HOUSTON -

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

Ladarian Dwayne Bimage, 21, has been charged with aggravated robbery in connection with a robbery on Sept. 19.

Two other people have been arrested in connection with that robbery. The UH police department said a group of former Elsik High School students was involved in 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."

Police also arrested Anthony Theus. He is accused of working at Sheikh Shoes at Memorial City Mall and knowingly allowed purchases with stolen credit cards.

Investigators said they are searching for a stripper named Sue Ortiz. She is accused of using stolen credit cards. Police also called it "cleaning credit cards." A warrant has been issued for her arrest.

At least three others are believed to be involved. Police said they do not know if three robberies in one week on the UH campus are connected.

Before the robberies, the UH police force had 45 officers. The department has added an additional five officers because of the recent rash of armed robberies.

"I am concerned. I want the city and citizens to be safe. My job is to arrest offenders when they commit crimes like this on campus," Moore said.

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