Portuguese Prime Minister, António Costa, says he has handed his resignation to the president, after investigators searched his official residence in an inquiry into alleged corruption.
He said he had not been named as a suspect but believed the inquiry was incompatible with staying in office.
Prosecutors said on Tuesday they were investigating concessions awarded for lithium mines and hydrogen production.
Five people have been detained, according to Público newspaper.
Among them are two people seen as close to Mr Costa, including his chief of staff, Vítor Escária, and a business consultant, Público reports.
Infrastructure Minister, Joao Galamba, has meanwhile been indicted as part of the inquiry into energy deals. —BBC
