Girl aged just 11 one of two bombers linked to terror group Boko Haram. Suicide bombings have killed 49 people in less than 24 hours.
An attack on churches in northeast Nigeria blamed on Boko Haram killed more than 50 people ahead of Nigeria's last-16 World Cup match against France.
The US, Britain and France are sending specialist teams to search for the missing schoolgirls, while China has pledged to provide satellite info.
Following Boko Haram's announcement that it's holding kidnapped schoolgirls as "slaves", international pressure has mounted to find and free them.
Boko Haram insurgents have killed 41 pupils in an attack on a school in Nigeria's Yobe state.
Suspected Islamist extremists have stormed a mosque and shot dead 44 worshippers and 12 others in a nearby village in Nigeria, say officials.
Nigeria's military has enforced a round-the-clock curfew in parts of the north-eastern city of Maiduguri, the home base of Boko Haram.
A construction company has evacuated its staff from a Nigeria site after gunmen blasted into the facility and kidnapped seven foreigners.
Islamist group Boko Haram have been accused of being suspects in the latest attacks on government buildings in the north of Nigeria.
Boko Haram has killed hundreds in attacks that authorities have been unable to stop, prompting calls for talks to bring an end to the bloodshed.