(CNN) -- An Egyptian police brigadier general was killed and five others were injured in bombings Wednesday outside Cairo University, the Interior Ministry said.
Three blasts rocked the area outside the main gate of the university campus -- the first two in quick succession and a third a little later.
Hundreds of police and security officials cordoned off the area, where forensic experts and sniffer dogs were brought in to investigate. Ambulances also arrived on the scene.
Attacks targeting security forces have become increasingly common in Egypt since the army deposed Islamist President Mohamed Morsy of the Muslim Brotherhood in July following mass protests against his rule.
In a statement, the Interior Ministry said Brig. Gen. Tariq al-Mirgawi, police chief of the criminal unit in West Giza, was killed in the blasts.
"Experts determined that the two explosive devices were planted in one of the trees in the area," the ministry said, adding that an investigation was under way.
A security source within the ministry told CNN the bombs appeared to be "homemade."