Witnesses said that they used silencers and used only one for the attack . Many bloody conflicts plague the impoverished country . Shiite rebels have long fought for independence , and Al Qaeda has a key hub in Yemen . Terrorist attacks in Yemen occur regularly .
Witnesses said that they used silencers and needed only seconds for the attack . Two bloody conflicts plague the impoverished country . Shiite rebels have long fought for independence , and al Qaeda has a key hub in Yemen . Terrorist attacks in Sanaa occur regularly .