ANALYSIS - Saudi Arabia fears militants use Yemen, new tactics

RIYADH (Reuters) - A recent attempt to assassinate Saudi Arabia's security chief has raised concerns over new methods of hiding explosives, as well as al Qaeda using Yemen to revive its operations against Saudi Arabia, experts say.

In August, a suicide bomber posing as a repentant militant blew himself up in the Jeddah office of security chief Prince Mohammed bin Nayef in the first known attack on a member of the royal Saudi family since al Qaeda began a campaign in 2003.