Kenyan police have arrested five suspects in connection with Thursday’s attack at Garissa University College, Interior Minister Joseph Nkaissery said Friday, according to CNN affiliate NTV. Nkaissery told reporters the university will be able to confirm Saturday if everyone has been accounted for. The militants killed 142 students, three security officers and two university security personnel. The attack left 104 people injured, some of them in critical condition, Nkaissery said. As search and recovery efforts continued, police found a man who was not a student hiding under a bed, sources said. He was taken into custody and was being treated as a suspect, sources close to the search said. After the man was discovered, authorities conducted an additional search of the building. Three people, all students, were found alive. One female student was under a pile of bodies; another was in a closet. A male student was hiding in a bathroom, the sources said. The Education Ministry has closed the university indefinitely. “In the time of shooting,” she said, “they skipped me.” Most of the victims had been shot from behind, in the back of the head, a medic told CNN. “They’re facing down, always,” a worker with St. John’s ambulance service said Friday. “They’re always facing down, and they’re shot in the heads, around the back.” Al-Shabaab’s long, bloody legacy with Kenya Raging gunfire The explosion and gunfire cut through Thursday morning’s quiet on the campus, 90 miles from Kenya’s border with Somalia, tearing students out of their sleep. “Never heard anything like this,” journalist Dennis Okari from CNN affiliate NTV tweeted as he watched smoke rising over a student hostel. The gunmen first stormed a Christian prayer service, where they killed some worshipers and took others hostage. Then they went across campus with them, shooting non-Muslims and sparing Muslims. They gave religious sermons as they killed, witnesses said. They headed for the hostels. Student Japhet Mwala lay in her bed. “We were sleeping when we heard a loud explosion that was followed by gunshots, and everyone started running for safety,” she told Agence France-Presse. Awaking to terror: ‘I am lucky to be alive’ “There are those who were not able to leave the hostels where the gunmen headed and started firing. I am lucky to be alive because I jumped through the fence with other students,” she said. Students ran – some crawled – away from the gunfire, Okari said. At one point, the gunmen pinned down a building where 360 students lived, Interior Minister Joseph Nkaissery said. Okari took cover outside the campus and listened to explosions and gunfire for four hours. Kenyan security forces moved in and killed four gunmen. Porous border Somali terror group Al-Shabaab, an al Qaeda affiliate, claimed responsibility for the attack. The Interior Ministry has posted a “most wanted” notice for a man in connection with it. It offered a reward of 20 million Kenyan shillings, about $215,000, for Mohamed Mohamud, who goes by the aliases Dulyadin and Gamadhere. The post does not say what role the man may have played. Kenyan police are circulating “Wanted Dead or Alive” posters featuring eight terror suspects who are wanted in separate attacks in Kenya, the Interior Ministry said. Police are offering a bounty of more than $210,000 for the suspects, the Ministry said via Twitter. The dangerously porous border between Somalia and Kenya has made it easy for Al-Shabaab militants to cross over and carry out attacks. In a December attack at a quarry, Al-Shabaab militants separated Muslims from others and executed the non-Muslims, killing at least 36 people. In November, militants stopped a bus near the border and killed 28 people they believed to be non-Muslims. Last month, the U.S. Embassy warned of possible attacks “throughout Kenya in the near-term” after the reported death of a key Al-Shabaab leader, Adan Garaar, who was suspected in the September 2013 Westgate Mall attack in Nairobi. Opinion: A weakened Al-Shabaab lashes out The security question Police have declared a curfew for the next several days in the region from 6:30 p.m. to 6:30 a.m. The Education Ministry has closed the university indefinitely. Surviving students have gathered in large groups at the town’s airport, waiting to be flown to their hometowns. The effects are also being felt 225 miles west in Kenya’s capital of Nairobi, where the new bloodshed reinvigorated an old debate: Is the nation’s security strong enough? Many thought measures taken after the Westgate Mall massacre had filled the gaps. At least 67 people died then. But Thursday’s attack is the second-worst in the country’s history, and it has evaporated much of the confidence won after Westgate. Civil liberty concerns had held up the enrollment of 10,000 new police recruits, but on Thursday, Kenyan President Uhuru Kenyatta gave a directive to process them. “Kenya badly needs additional officers,” he said, “and I will not keep the nation waiting.” The problems plaguing Kenya’s security efforts