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COLLEGE PARK, Md. (WUSA) -- A second weapon was found in the murder-suicide case that happened in College Park on Tuesday morning, police said.

"This weapon was not used but was found near the suspect in a bag also containing a machete, a baseball bat and ammunition. The fully-loaded, semi-automatic weapon was a .22 caliber rifle manufactured by Israel Weapons Industries (IWI). The model is an UZI B. Dayvon Green bought this weapon legally on January 18, 2013, from a gun store in Silver Spring, Maryland," Prince George's County Police said in a news release.

Prince George's County police have identified the shooter in the murder - suicide in College Park on Tuesday morning as 23-year-old Dayvon Maurice Green. He was a graduate student at the University of Maryland and NASA student ambassadorwho reportedly suffered from a mental illness, say police.

Green is accused of shooting two of his roommates at approximately 1 a.m. Tuesdayat a single family home on the 8700 block of 36th Avenue in College Park, Maryland. The house is off-campus but in an area where a number of college students rent rooms and houses.

MAP: Recent Crime In Area Of College Park Shooting - via The Diamondback

Police say that when they arrived on the scene, they found one of the students shot in front of the house, one studentdown on the street critically shot and a third student in the backyard who was pronounced dead at the scene.

According to police, Green is believed to have set small fires in the basement and backyard of the house. A police spokesperson during a news conference on Tuesday afternoon said one roommate with a room facing the backyard woke up to see fire and alerted a second roommate. They went to investigate and met up with Green. They talked and agreed to put out the fires, but as they walked toward the home to get water, a roommate saw Green reaching for a gun in his waistband, say police. The roommate started to run away from the home and heard gunshots. He then realized he had been hit and started running towards a neighbor's house for help. At this time, he has only been identified as a 22-year-old undergraduate. He suffered non-life threatening injuries.

The other student was also shot and collapsed. He was later pronounced dead at a hospital. The student was identified as 22-year-old Stephen Alex Rane of Silver Spring. He was an undergraduate at UMD.

Then, police say that the gunman went to the back of the home and turned the gun on himself.

Police say they recovered the 9 millimeter handgun used in the shooting next to Green's body. They say they also found a bag of weapons, which included a baseball bat, a machete, a loaded semi-automatic handgun and ammunition. Police say they are working with the ATF to determine when and how the guns were bought.

Daylight showed that gunfire had shattered a neighbor's car window and we spotted a neighbor taping up a broken window at one home.

The University of Maryland President Wallace Loh released a statement earlier concerning the incident.

"The University of Maryland community awoke this morning to heartbreak. We are all shocked and saddened by this morning's tragic events. We extend our deepest sympathies and prayers to the families and friends of the victims.

I have asked that all appropriate University resources, including our own University Police Department, assist the Prince George's Police Department in this matter.

During times of loss, community and support are essential components for understanding and healing. I ask that the entire University of Maryland family come together during this time of grief. On campus, our places of worship and the Counseling Center are open for those who need support and comfort. Ours is a university of great resolve. Together, we will emerge from our collective sadness."

Anyone with information about this case is asked to call the Prince George's County Police Department's Homicide Unit at 301-772-4925 or Crime Solvers at 1-866-411-TIPS (8477).

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