Further clashes have broken out in central Nigeria between armed Christian and Muslim groups near the city of Jos. Bombings on Christmas Eve killed 32 people there.
Witnesses said buildings were set alight and people were seen running for cover as police and soldiers arrived.
Previous ethnic violence in the region has killed hundreds.
The latest unrest was triggered by explosions on Christmas Eve in villages near Jos.
Vice President Namadi Sambo is reported to be on his way to the area.
The BBC reports Friday's bomb attacks near Jos also left 74 people wounded after two bombs exploded near a large market.
A third was in a mainly Christian area while the fourth was near a road leading to a mosque. No group has claimed responsibility.
President Goodluck Jonathan has pledged to bring those responsible to justice.
Jos has been blighted by religious violence over the past decade with deadly riots in 2001 and 2008.
The BBC reports the tensions stem from decades of resentment between indigenous groups and settlers from the north, a region that is mainly Muslim.
