French-backed Malian forces are battling Islamist militants in a key town that leads toward the city of Goa, a militant stronghold in the country's north.
Residents and security officials say French and Malian forces fought rebels in Hombori, on Friday, a town about 250 kilometers from Gao.
Meanwhile, local officials say militants have bombed a strategic bridge near the border with Niger.
A French-led international counter-offensive against Islamist militants who seized control of much of northern Mali last year has entered its third week.