A gunman killed two people and himself in a shooting at a lumber plant near the central Swiss city of Lucerne on Wednesday, local media reported.
Seven people were seriously injured in the attack, Swiss daily newspaper Neue Luzerner Zeitung cited police as saying.
Rescuers flew four critically wounded people to two area hospitals, air rescue spokeswoman Karine Hoerhager said.
The situation is under control, said Lucerne county police spokesman Urs Wigger, and officers have cordoned off a wide area around the factory.
The incident took place at 9 a.m. local time (3 a.m. ET) at the offices of Kronospan, a manufacturer of wood products in the village of Menznau, about 30 kilometers (19 miles) outside Lucerne.
The factory employs 350 people, Neue Luzerner Zeitung said.
Local media reports suggest the plant has had to cut production because of a reduction in the timber harvest.
A spokesman for Kronospan in the United Kingdom said it had limited information about what happened.
“It’s a terrible tragedy and our thoughts are with the families of the people who have lost their lives,” he said.
Initial reports suggested the number of people killed might be higher.
The gunman’s identity and the motive for his attack are not yet known, and police have yet to name the victims.
CNN’s Fred Pleitgen, Saskya Vandoorne and Carol Jordan contributed to this report.