Dubai's port operator says an oil tanker is on fire after striking a container ship in a shipping channel at the city's Jebel Ali Port, AP reports.
DP World spokeswoman Sarah Lockie said no casualties have been reported. Authorities have been alerted.
She said crews are trying to contain the blaze and determine how to clear the channel.
Clouds of smoke could be seen rising from the area of Tuesday's collision. The port is on the southwestern end of the city, in the direction of Abu Dhabi.
Lockie said the container vessel is a medium-sized "feeder ship."