One person has been killed inside a Purdue University classroom by a gunman who surrendered to a police officer within minutes of the attack in Midwestern Indiana state, officials said.
Purdue Police Chief John Cox said the suspect appeared to have targeted the male victim in a basement classroom of the Electrical Engineering Building about noon and didn't attack anyone else.
"The individual entered the facility and took the actions that he took, and then immediately left the facility without any other interaction that we're aware of," Cox said.
The suspect gave himself up to a West Lafayette police officer outside the building on the 40,000-student campus, he said.
Cox and Purdue Provost Tim Sands told reporters during an afternoon news conference that they had not yet confirmed the identities of either the suspected gunman or the victim.
Cox said the man arrested wasn't immediately cooperating with investigators.
Purdue officials issued a text alert telling those on the campus about 60 miles (96 kilometers) northwest of Indianapolis to seek shelter shortly after the shooting was reported. Within two hours, the university said there was no ongoing threat on campus and allowed normal operations to resume in all buildings except the engineering facility.
The attack came on the heels of at least two school shootings in the US last week, one in Philadelphia that left two teenagers wounded and another in New Mexico that injured an 11-year-old boy and a 13-year-old girl.
Students at Purdue described a chaotic scene when the first report came in.
Julissa Martinez, a nursing student from Portage, said she was in psychology class on another part of campus when she received the text message saying the university was on lockdown. She said her professor briefly kept teaching, then stopped lecturing so that students could contact people to let them know they were safe.
"He tried to get everything under control because people were freaking out," she said.
This is a pic from my friend but does not have twitter. People were hiding in the lab pic.twitter.com/D7nYjDPwEL— Wei Liu (@weiwuu) January 21, 2014