A fire has broken out at an office of Nigeria's electoral commission (Inec) in Anambra state, in the south-east of the country, police have confirmed to BBC Pidgin.
It is the third blaze to have hit an Inec office this month and happened just four days before Nigerians go to the polls to elect a new president.
In a statement following a fire at the weekend in Plateau state, in the centre of the country, Inec indicated that it thought that was the result of arson describing it as an "emerging trend". Nearly 6,000 voters' cards were destroyed along with other election materials.
Inec also called on the police to provide extra security.
The police are investigating the incidents.
Tuesday's fire was in the Inec compound in the Anambra state capital, Awka. The police said that it happened inside a shipping container, but it is not clear what has been damaged.
Local media are reporting that card readers were inside the container.