At least 137 of nearly 300 Nigerian children abducted more than two weeks ago from their school in the northwestern state of Kaduna were released on Sunday, the West African nation鈥檚 military said.

An earlier statement from the government suggested that all the students were freed.

Motorcycle-riding gunmen invaded the Kuriga school on March 7 and marched the children into the forests before security forces could arrive, as terrified families watched helplessly. School authorities said a total of 287 students were kidnapped during the attack, at least 100 of them are aged 12 or younger.

At least 1,400 students have been kidnapped from Nigerian schools since 2014, when Boko Haram militants seized hundreds of schoolgirls from Borno state鈥檚 Chibok village. In recent years, abductions have been concentrated in the country鈥檚 northwestern and central regions, where dozens of armed groups often target villagers and travelers for ransom.

The 137 children were rescued in Zamfara state, an enclave notorious for kidnappings more than 200 kilometers (124 miles) away from their school, Nigerian military spokesman Maj. Gen. Edward Buba said in a statement.

Pictures released by the Nigerian military showed the children looking worn out as they were covered in dust, still wearing their blue-white-and-brown uniforms while being transported following their release. Kuriga town leaders joined other government officials in waiting for their arrival at the Kaduna State Government House.

鈥淓fforts would continue until other hostages are found and the terrorists arrested, tried, and brought to justice by Nigerian law,鈥� Maj. Gen. Buba said.

At least 17 other schoolchildren in northern Sokoto state were also rescued two weeks after they were taken hostage, according to a statement issued Saturday by the Sokoto state government.

Kaduna state Gov. Uba Sani, who first announced the rescue, did not give details about the operation. His office could not be reached Sunday to clarify the discrepancy in the number of those freed. The Associated Press could not reach villagers in Kuriga town, where mobile network is not available.

Under growing pressure to end the mass kidnappings in northern Nigeria, President Bola Tinubu promised his administration is 鈥渄eploying detailed strategies to ensure that our schools remain safe sanctuaries of learning, not lairs for wanton abductions.鈥�

Tinubu had vowed to rescue the children 鈥渨ithout paying a dime鈥� as ransom. But ransoms are commonly paid for kidnappings, often arranged by families, and it is rare for officials in Nigeria to admit to the payments.

No group has claimed responsibility for the Kaduna kidnapping, which locals have blamed on bandit groups known for mass killings and kidnappings for ransom in the conflict-battered northern region, most of them former herders in conflict with settled communities.

At least two people with extensive knowledge of the security crisis in Nigeria鈥檚 northwest told AP that the identity of the abductors is known.

Murtala Ahmed Rufa鈥檌, a professor of peace and conflict studies at Usmanu Danfodiyo University, and Sheikh Ahmad Gumi, a cleric who has negotiated with the bandits, said they were hiding in the region鈥檚 vast and ungoverned forests.

Arrests are rare in Nigeria鈥檚 mass kidnappings, as victims are usually released only after desperate families pay ransoms or through deals with government and security officials.

Chinedu Asadu, The Associated Press