About 19 people were killed and 143 more injured when a bomb went off near an army camp in northern Cameroon, where soldiers are battling Boko Haram fighters from Nigeria.

The first bombing took place shortly before noon in the marketplace of Kerawa, a city on the border with Nigeria, said the sources, speaking on condition of anonymity.

“For the moment we don’t have a death toll”, a law enforcement official said.

The next attack happened around 2 p.m. (9 a.m. ET) Saturday in Hambagda village in Borno state’s Gwoza district, 80 miles from Maiduguri and a few miles from Boko Haram’s de facto capital.

President Muhammadu Buhari had given the Nigerian military a marching order, mid August, to ensure that the Boko Haram terrorists are crushed in three months.

He said the attack was carried out during the recent take-over of Gamboru-Ngala by government troops.

Army and police sources said another blast hit a market.

No group has claimed responsibility for the attack.

The spokesman refrained from saying, however, whether any militants or army troops had been killed in the recovery operation.

“They shot 18 people dead in Kolori before moving on to Ba’na Iman, where they killed another seven”, he said from Biu, the largest town in the area.

Boko Haram militants have increased the number of attacks on countries bordering its north-eastern Nigerian stronghold – Chad, Niger and Cameroon – after they participated in a regional offensive against them earlier this year.

Almost 20,000 people have died in Boko Haram’s six-year-old uprising. The Nigerian government has also been communicating to the people that its military has regained control of some towns that were previously commandeered by Boko Haram.