N'Djamena - At least 14 people were killed in a suicide bomb attack at a crowded market in Chad's capital on Saturday just days after Boko Haram claimed a previous bombing in the city that left 38 people dead.
The attack in N'Djamena by a man disguised as a woman in a full-face veil came after a botched bombing of a bus station in the restive capital of Borno state, Maiduguri, which killed two pedestrians.
Both attacks again underlined the threat still posed by the militants, despite claimed military successes in recent months and with a new regional force set to take on the group at the end of the month.
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Experts said the bombing in Chad, following previous strikes in Niger and repeated targeting of northern Cameroon, demonstrated the need for an effective solution to the problem involving both Nigeria and its neighbours.
President Muhammadu Buhari, who came to power on May 29, has made defeating Boko Haram a top priority but experts said he could not do it alone.
"The fight against Boko Haram is unlikely to be concluded with any rapidity," Ryan Cummings, chief Africa analyst with the Red24 consulting group, told AFP.
"The fact remains that while Boko Haram continues to be defined as a Nigerian problem, evidence suggests that it has become a quandary of regional proportions requiring a regional solution.
"In the absence of Nigeria's neighbours recognising the extent of Boko Haram's regional contagion and subsequently responding to it decisively, the most exhaustive efforts by the Nigerian government alone won't solve the problem."
Police director-general Taher Erda said the bomber detonated his explosives belt when he was stopped at the entrance to the market for security checks.
The provisional toll was 14 dead, nine of them female traders, said police spokesman Paul Manga. One of the five men killed was a police officer, he added.
An AFP correspondent at the scene described a gruesome scene of pools of blood and human flesh. The area, in the heart of the capital, was cordoned off by security forces after the attack at about 8:45 am (0745 GMT).
On June 15, 38 people were killed when two suicide bombers blew themselves up at a police academy and the city's main police station.
In the wake of that attack, the authorities in the Muslim-majority country ordered a complete ban on the full-face veil and bombed Boko Haram positions in Nigeria.
Boko Haram this week claimed responsibility for the attack in a statement in Arabic on Twitter.
The communique was signed "Islamic State, West Africa Province", as Boko Haram has styled itself since pledging allegiance to the Islamic State group in March.
The attack in Maiduguri happened at about 7:10 am (0610 GMT) Saturday as two bombers in a motorised rickshaw tried to get into the busy Borno Express Terminal but were deterred by heavy security.
Boko Haram's deadly insurgency has killed at least 15,000 people since 2009 and left more than 1.5 million others homeless.
A four-nation coalition of Nigeria, Niger, Chad and Cameroon has reportedly pushed out the militants from captured towns and villages in an operation that began in February.
But since Buhari came to power, attacks have increased and with the latest bombing in Maiduguri, nearly 570 people have been killed in Nigeria alone, according to AFP reporting.
Borno state in particular has been worst hit and on Friday, eight people were killed in Gamboru, when Boko Haram fighters opened fire on residents returning to the abandoned town from Fotokol, just across the border in northern Cameroon.
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Buhari has announced that the military command and control centre would be moved from Abuja to Maiduguri. But there is little evidence so far the move has been effective.
The 72-year-old former military ruler is now coming under pressure to act soon and is pinning his hopes on the deployment of a strengthened regional force at the end of this month.
Experts say the 8,700-strong force, to be commanded by a senior Nigerian officer from headquarters in N'Djamena, will only be effective if coordination between the partners is improved.
Foreign forces will also need free reign to pursue Boko Haram in Nigerian territory after Chadian and Nigerien troops were ordered to retreat by the previous administration in Abuja.