What appears to be fresh video from a surveillance camera shows two armed men running toward a fence, followed by a suicide bomber who just seconds later detonates the explosives.

The video, time-stamped Sunday, is said to be from Baghdad, where a private Shiite college was bombed at its main gate. Three militants attacked the college’s back gate as well, but it is unclear if this gate saw an explosion too.

Image source: LiveLeak

Image source: Live Leak

Image source: LiveLeak

Image source: Live Leak

Image source: LiveLeak

Image source: Live Leak

One teacher and four policemen were killed while 18 other people near the scene were wounded.

It is unclear if this video is actually from Sunday’s attack, if it is another attack or if the footage or time stamp were altered in any way. Check it out (Content warning: Images in this video may be disturbing):

Hours after the attack, an Al Qaeda spin-off group known as the Islamic State of Iraq and the Levant claimed responsibility for the attack, accusing the college’s professors of teaching students to “curse” the Prophet Muhammad and training them to “fight” the Sunnis in Iraq and Syria.

Iraqi security forces stand guard at the main gate of a Shiite private college following an attack by militants, in Baghdad’s eastern neighborhood of Ur, Iraq, Sunday, April 20, 2014. A suicide bomber with an explosives belt attacked the main gate of a Shiite private college while three militants attacked the back gate, leaving several people dead and over a dozen people were wounded. Security forces killed all of the attackers. (AP/Khalid Mohammed)

A suicide bomber with an explosives belt attacked the main gate of a Shiite private college while three militants attacked the back gate, leaving several people dead and over a dozen people were wounded. Security forces killed all of the attackers. (AP/Khalid Mohammed)

The authenticity of the statement could not be independently verified, but its style was consistent with previous statements.

The U.N. Special Representative in Iraq, Nickolay Mladenov, described the college assault as a “vicious and cowardly attack on innocent civilians.”

A policeman stands guard in a damaged classroom after a suicide attack in Baghdad’s eastern neighborhood of Ur, Iraq, Sunday, April 20, 2014. A suicide bomber with an explosives belt attacked the main gate of a Shiite private college while three militants attacked the back gate, leaving several people dead and over a dozen people were wounded. Security forces killed all of the attackers. (AP/Khalid Mohammed)

A policeman stands guard in a damaged classroom after a suicide attack in Baghdad’s eastern neighborhood of Ur, Iraq, Sunday, April 20, 2014. (AP/Khalid Mohammed)

“This is yet another example of sectarian-based violence that the people of this country need to fight in order to bring this country to tranquility,” Mladenov said in a statement. “The target has been selected to incite sectarian hatred, with utter disregard for human life and religious values,” he added.

At least 18 people were killed and nearly 50 wounded in several attacks in Iraq Sunday.

The Associated Press contributed to this report.