paris grenade throw french soldier wound three civilians burkina faso capital ouagadougou shortly arrival french president emmanuel macron radio france international report tuesday grenade throw late monday hours macron due speak university audience ouagadougou radio station cite security source say two hood individuals throw grenade motorbike flee scene radio say immediate comment incident macron office macron german chancellor angela merkel due address eu-africa summit abidjan week focus education investment youth economic development prevent refugees economic migrants attempt treacherous journey across mediterranean grenade throw french troop burkina faso wound three macron 's arrival report