Royal Dutch Shell said it had contained a fire at its 500,000 barrel-per-day (bpd) refinery in Singapore.
The company said all its staff were accounted for and non essential staff had been evacuated to safety.
"We believe it was an accident. A full investigation will be conducted once the fire is put out," Shell said.
Neighbouring units were shut down as a precaution. In the process of a shutdown, Shell advised that a larger flare would be visible and that the flare was no cause for alarm, as no toxic vapours were being released.
One Shell firefighter sustained a superficial injury, and five other firefighters had heat exhaustion and pulled muscle, the company added.
Shell had earlier said it shut some units at its refinery after the fire.
(Reporting by Naveen Arul in Bangalore)
Trending On Reuters
Barack Obama on Friday became the first incumbent U.S. president to visit Hiroshima, site of the world's first atomic bombing, in a gesture Tokyo and Washington hope will showcase their alliance and reinvigorate efforts to rid the world of nuclear arms. Read
- N.Korea threatens retaliation after S.Korean warning shots
- Islamic State drives Syria rebels from near Turkish border
- Syrian refugee finds home among the beards of Budapest
- Bashing Trump not enough for Democrats to win Latino vote, advocates warn
- Iraqis fleeing Mosul to Syria, up to 50,000 anticipated - UNHCR