Nigerian police arrested a 13-year-old girl wearing an explosives-packed vest in the northern city of Kano hours after an attack by two female suicide bombers at the textile market, a security source and a witness said Thursday.

The girl turned up at a clinic on the outskirts of Kano hours after a double bombing at at the ever busy market in the city.

“The people there called the attention of security personnel who found explosives primed for a suicide attack on her,” said the security source, who requested anonymity, in an account confirmed by a nurse at the clinic.

The location of the clinic — some 20 kilometres (12.5 miles) from the scene of a double suicide attack by two women on a textile market just hours earlier — raised suspicions.

“We alerted the police who immediately mobilised and arrested the duo,” said one nurse, who asked to remain anonymous for security reasons.

“On searching her, the police discovered explosives hidden under her hijab, confirming our suspicion. They took her and the man accompanying her away.”

The senior security source said the young girl was from the northeastern state of Bauchi and had been part of the “suicide team” that attacked the busy Kantin Kwari textile bazaar.

Four people were killed in that attack and seven others injured.

“Her arrest is a huge breakthrough in unravelling the spate of suicide attacks by young girls in the city,” the source added.

Boko Haram has increasingly used women as suicide bombers in attacks ranging from Borno state in the far northeast to Niger to the northwest.

Just last month, at least 120 people were killed when two suicide bombers blew themselves up at Kano’s central mosque and gunmen opened fire on worshippers as they fled.

Security analysts have seen the use of women — whether voluntarily and ideologically motivated or coerced — as a sign that Boko Haram wants to sow fear and terror further afield.

In July, a 10-year-old girl was discovered wearing a suicide vest in Katsina state, also in the north.

President Goodluck Jonathan, accepting his party’s nomination to run for re-election on Wednesday night, said the military was making some gains in the fight against the militants.

The military has reported the seizure of several towns captured in recent months and also successful operations that have left dozens of Islamist fighters dead.

But in a sign of the scale of the task — and the need to provide better security everywhere in the remote region — a local government official said 11 people were killed by gunmen in the town of Gajiganna in Borno state.

“The terrorists also injured (several) people and set on fire every single house in the village,” said Zarami Kolo.

Gajiganna has large markets that attract traders from across Borno state as well as from neighbouring Chad and Cameroon.