Masked gunmen shot dead a Yemeni man on his way to work at the U.S. embassy in Sanaa on Thursday, Oct 11, a security source said.

The attackers on a motorcycle opened fire on a car carrying Qassem Aqlan - who headed an embassy security team - in the center of Yemen's capital, Reuters quoted the source as saying.

"This (assassination) operation has the fingerprints of al-Qaida which carried out similar operations before," said the source who asked not to be named.