President Hollande confirmed four French deaths among the 18 people killed by gunmen in an attack claimed by al-Qaeda in the Islamic Maghreb.
Six other members of a group of about 50 troops were injured after an avalanche hit their skiing exercise at an altitude of more than 2,000 metres.
Up to 27 people are feared dead and 33 wounded after suspected Islamist gunmen attacked a hotel and bar in the West African state's capital.
The teacher led his pupils onto a closed black piste where two of the teenagers and a nearby tourist died after becoming engulfed in an avalanche.
After a man believed Syrian was hit by a car on a local motorway Thursday, another person died after being hit be a Channel Tunnel freight train.
Police said the bodies were at the foot of Vauban Fort on the French Channel island of Chausey, and suspected they had slipped while having sex.
The two officers were accused of failing to help two boys who fled from them into a power substation near Paris in 2005, sparking weeks of riots.
The French president urged a meeting of foreign, interior ministers after drownings of about 700 EU-bound migrants off Libya this weekend.
A cross-country skier was the 28th person killed by avalanches in the French Alps this winter, while four Italians died on slopes in Switzerland.
Days of heavy rainfall followed by violent storms have caused flash flooding, with the southern Var département (county) hit worst.
A 33 year-old Australian died after jumping from a 2,600-metre peak, while a 52 year-old Frenchman is thought to have hit a rockface.
A total of 304 people were killed in accidents on France's roads last month compared with 344 in the same period in 2013.
A French charity reports that at least 453 homeless died around France in 2013, calling for a public remembrance ceremony on March 18th.
The 21,341 recorded bird deaths were mostly Atlantic puffins, guillemots and razor-billed auks which starved after winds blew them off course.