A small fire at Suzuka caused a temporary stoppage to private track testing for Super GT teams Nakajima Racing and Mugen on Wednesday.
A fire broke out on the grass on the exit of Turn 1, heading into Turn 2, requiring the test to be stopped while circuit officials attended to the flames.
There are no reports of any damage to any of the circuit's infrastructure, aside from burnt grass, and the track has since re-opened to continue with the test.
"Regarding the fire that occurred in Suzuka Circuit on March 17th, there are several possibility of the cause, and now we are verifying it together with countermeasures," said a statement from the circuit.
"The fire broke out between Turn 2 and Turn 3 but was taken under control by our staff and course marshals, no one injured, and no damage to the facility at all except for the burned grass."
The private test at the circuit is taking place ahead of the Super GT season opener, which takes place at the Okayama Circuit on the weekend of April 10 and 11.