Two suicide bomb attacks killed at least 13 people in northern Cameroon on Wednesday, the president's office said, in what appeared to be the deepest incursion by Boko Haram militants from neighboring Nigeria.
The first explosion hit a market and the second a densely populated neighborhood, both in the capital of Cameroon's Far North region, Maroua, a military source told Reuters.
No one claimed responsibility, but Boko Haram has stepped up attacks on the countries bordering its northeast Nigerian stronghold - Chad, Niger as well as Cameroon.
All three have contributed troops to a regional offensive against the Islamist militants who have allied themselves to Islamic State and pose one of the biggest security threats in the combustible region.
"People were running in all directions," said Celestin, a teacher, who said he had just arrived at the city's central market when the first bomb went off.
A statement from the office of President Paul Biya said 13 people were killed in the attack. Cameroon state television channel CRTV quoted the region's governor saying 17 people died.
The blasts came 10 days after two suicide attacks killed 13 people in Fotokol, about 300 km (200 miles) north of Maroua.
(Reporting by Sylvain Andzongo and Josiane Kouagheu; Writing by Bate Felix; Editing by Andrew Heavens)
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