Nigeria's acting President Goodluck Jonathan has dissolved the country's cabinet, government sources say.
Mr Jonathan became acting president in February amid the continuing illness of President Umaru Yar'Adua.
Mr Yar'Adua went to Saudi Arabia for treatment in November last year and, despite returning to Nigeria recently, has not been seen in public.
The cabinet was picked by Mr Yar'Adua and correspondents say Mr Jonathan is now trying to stamp his own authority.
Mansur Liman of BBC Hausa says there had been rumours of the dissolution for some time and Mr Jonathan had already changed several senior personnel.
But our correspondent says this is the biggest move Mr Jonathan has made since becoming acting president and he is clearly plotting a new course for the government.
It was only on 9 February that the National Assembly appointed Mr Jonathan as acting president, allowing him to sign legislation, chair cabinet meetings, reshuffle ministers and release oil funds.