Honeywell has shut down its Stinson Boulevard plant in Minneapolis for deep cleaning and sanitization after four employees tested positive for COVID-19.
A worker tested positive on Tuesday, and then three more positive tests came back Thursday, the company said.
The plant makes sensors and laser gyros.
Honeywell said it had moved machines and work cells apart to allow social distancing several weeks ago. Workers must wear masks.
The temporary plant shutdown is "out of an abundance of caution for the safety of our employees," the company said in a statement.
Employees will be paid during the closure, the statement said.
Honeywell's temporary closure comes the same week that Renewal By Andersen closed its replacement-window plant in Cottage Grove after two workers tested positive for COVID-19.
Contact tracing is being conducted so anyone who had contact with the infected workers can be notified, officials said.