Brazilian federal police have served a Brazilian subsidiary of Oslo-listed Seadrill with a search and seizure warrant as part of the ongoing Operation Car Wash corruption probe.

The John Fredriksen-backed drillship and rig company said in a stock exchange announcement that the warrant was served on Seadrill Serviços de Petroleo on Wednesday as part of the latest phase of Operation Car Wash.

It was unclear what prompted the action, but Seadrill said it was “cooperating fully with the ongoing investigation”.

Launched in 2014, Operation Car Wash is investigating corruption and bribery allegations involving state-owned oil major Petrobras.

Police and prosecutors believe Petrobras contracts were overinflated and the cash either creamed off for personal use or paid off to political parties, including the Workers Party of then President Dilma Rousseff.

The probe shed light onto what has become one of Brazil’s largest corruption scandals, and has resulted in numerous business executives, government officials and politicians being handed down lengthy jail sentences and hefty fines.

International offshore sector players, including offshore vessel operators and shipyards have also been caught in its net, leading to stiff fines being levied.

The effect has also been felt in court rooms from Oslo to Singapore, where senior executives at companies found guilty of wrongdoing have been raked over the coals.

As far as Tradewinds has been able to ascertain, Seadrill has so far not been implicated in investigations.

Sevan Drilling, which Seadrill bought into in 2011, was extensively probed in both Brazil and Norway over offshore contracts awarded to Sevan by Petrobras between 2005 and 2008, but was later cleared of any wrongdoing.

Seadrill currently has a very limited presence in the Brazilian market. A fleet status report posted on its indicated that only one deepwater drillship, the 2013-built West Tellus, was in working on charter to Petrobras