No further details were given about the exact nature of the concerns but protest organisers questioned the legitimacy of the move and eyed a possible political motive. And for Mr. Mbu, he may have stirred a fresh controversy about his proclivity to invoke non-existing law to satisfy the presidency.

“There is no BASIS for and no POWER of FCT Commissioner of Police to ban peaceful assembly of any group of persons in… the city. None @ ALL,” said Oby Ezekwesili on her Twitter account @obyezeks.

The protest against abduction of school girls by Boko Haram: now banned in Abuja

The group’s lawyer, Femi Falana, added: “The decision to ban the protest is insane. We are going to court as soon as possible to challenge the ban. The ban is illegal.

“We have been fully briefed and we are putting our papers together to challenge the ban.

“It is illegal because a court of competent jurisdiction has ruled in December 2007 that no police permit is needed to stage a peaceful protest anywhere in Nigeria.”

Bring Back Our Girls spokesman Rotimi Olawale added that the protesters were “unperturbed” and would meet again in the capital on Tuesday.

“We have been peaceful in our protest. We don’t obstruct traffic or constitute ourselves to public menace,” he added.

 Noisy street protests in Abuja have become a regular feature of the campaign to keep the mass kidnapping of the girls in the public domain, as well as pressure on Nigeria’s government.

The demonstrations grew out of a social media campaign #BringBackOurGirls, which attracted worldwide support from ordinary people to US First Lady Michelle Obama and Pope Francis.

Copycat demonstrations have also been held around the globe.

Families and supporters of the missing girls were critical of Nigerian President Goodluck Jonathan’s response to the abduction, accusing him of being slow to react and indifferent to their plight.

In the weeks after the April 14 abduction, Nigeria has been forced to accept foreign help, including from the United States, to try to find the girls.

The protests meanwhile have grown to involve activists and campaign groups, who have sought meetings with senior figures in Jonathan’s administration, including the president himself.

But on Wednesday last week, the high-profile marches descended into violence after scores of young men attacked women protesters, throwing chairs, bottles and stones.

Some of the men were carrying posters in support of Jonathan, protest leaders said, although there was no immediate evidence connecting the gang to the head of state or his ruling Peoples Democratic Party (PDP).

 Information minister Labaran Maku claimed afterwards that the majority of the protesters were members of the main opposition All Progressives Congress (APC), which is looking to unseat the PDP in next year’s general election.

Banners of the smaller opposition Labour Party have been seen on previous marches, according to AFP reporters.

Ezekwesili, however, is a former education minister under former president Olusegun Obasanjo — Jonathan’s mentor — and a regular presence at the demonstrations.

The former World Bank executive claimed that FCT commissioner of police, Joseph Mbu, did nothing to prevent last week’s violence and said the ban indicated that Nigeria’s government wants to deflect attention from itself.

“Banning protests in Abuja further underlines our govts not wanting to take responsibility,” she tweeted.

Mbu was recently transferred from Rivers state in the southern Niger Delta region to the capital, amid accusations that he was doing the presidency’s bidding — charges he has denied.

The Rivers state governor Rotimi Amaechi, who defected from the PDP to the APC last year, accused the police chief of targeting opposition rallies after police fired live bullets and teargas at APC members.

Mbu said at the time that teargas was used only because organisers did not have an official permit to demonstrate.