Nigeria’s President Muhammadu Buhari says he has ordered the police and military to be “ruthless” with vote-riggers, following the last-minute postponement of the general election.
Critics said his comments condoned “jungle justice”.
The incumbent president also called the electoral commission incompetent and ordered an investigation into why the vote was delayed.
Election officials cited “logistical” reasons for the postponement.
Nigeria’s main opposition party, the People’s Democratic Party (PDP), said it was a “direct call for jungle justice”.
“It is indeed a licence to kill, which should not come from any leader of any civilised nation,” said PDP party spokesman Kola Ologbondiyan.
Mr Buhari also hit out at the Independent National Electoral Commission (Inec).
In his speech to senior party members about the postponement, Mr Buhari said questions needed to be answered about “why such incompetence manifested itself” and promised an investigation.
Inec postponed the election just over five hours before polling stations were due to open on Saturday morning.
They said this was because of problems with transporting ballot papers to some parts of the country.
The presidential and parliamentary polls will now be held on Saturday 23 February.
Governorship, state assembly and federal area council elections have been rescheduled until Saturday 9 March.
The two main parties have said they intended to resume their campaigns