Up to half of the food aid meant for people displaced by Nigeria’s Islamists insurgency has reportedly not been delivered, the government says.
The government termed the situation as a “diversion of relief materials”, which is thought to mean the aid was stolen.
A statement from the acting president’s office added that security was being beefed up to protect the deliveries.
Islamist militant group Boko Haram has waged war in Nigeria for more than one decade, killing thousands and forcing more than two million to flee their homes.
The situation got worse due to poor rainfall in West Africa, meaning about 8.5 million Nigerians, mostly in the north-east, need lifesaving aid.
In the latest suspected Boko Haram attack on Sunday, 12 people were killed by five suicide bombers in a village near Maiduguri, the capital of Borno state.
The statement from acting President Yemi Osinbajo said aid going missing had “dogged food delivery” and then cited reports saying that more than 50 lorries out of every 100 sent to the north-east never reach their destination.
It does not say what has happened to the diverted food, but in May two Nigerian officials were jailed for selling food aid.