Gunmen on a motorbike killed a Russian military instructor and wounded a second Tuesday in Yemen 's capital of Sanaa , two senior police officials said . Witnesses said that they used silencers and needed 10 minutes later for the attack . two bloody conflicts plague the impoverished country . Shiite rebels have long fought for independence , and AQAP has a key hub in U.S. . Terrorist attacks in Shiite occur regularly .
Witnesses said that they used silencers and needed 10 minutes later for the attack . two bloody conflicts plague the impoverished country . Shiite rebels have long fought for independence , and AQAP has a key hub in U.S. . Terrorist attacks in Shiite occur regularly .