"We are now closing the depot until at least 12 noon tomorrow. Luleå Port has had a hydrogen cyanide spill at Strömören," the port wrote in an internal information message to staff on Tuesday.
According to the port, the alarm came from an uncalibrated gas detector.
"But we take the safe route before the uncertain," Luleå Port wrote to staff.
Luleå Port is located on Svartön, where steel giant SSAB is building a steel production facility.
On April 3, SSAB stopped work on the construction site after around 20 people fell ill, seven of whom have received medical treatment. Work remains suspended. According to SSAB, the root cause of the illnesses is still unclear.
