MotoGP's opening practice session at Aragon has been delayed by more than an hour due to oil on the track.
The spill came during the earlier Moto3 practice, with Danny Webb's Mahindra the apparent culprit.
Several trackside vehicles, including two fire engines and a track sweeper, were needed to deal with the spill, which was made worse by the fact the track was already wet.
After an hour of cleaning work, practice was finally able to get underway.
MotoGP hit trouble in last year's visit to the Spanish circuit, with practice having to be cancelled due to a power cut.