Aqaba attack may signal new Zarqawi front in Jordan (Reuters)

AMMAN (Reuters) - A rocket attack which narrowly missed two U.S. warships in Jordan may be a signal Iraq's al Qaeda leader Abu Musab al Zarqawi has opened a new front against Washington's closest Arab ally, security experts said on Sunday.

The two U.S warships were likely to be carefully chosen targets, the experts said. The vessels are among those that have been regularly docking and unloading supplies in the Red Sea port of Aqaba since the U.S. led the invasion of Iraq in 2003.

Jordanian intelligence experts say the attack using Katyusha rockets indicates Zarqawi may favor expanding military attacks to pro-U.S. ally Jordan to hurt Washington's war effort in Iraq.

"Zarqawi appreciates more than ever that by hitting the U.S. military in Jordan he would score not just a symbolic victory but maybe disrupt a hitherto safe supply route for the U.S. army into bases in the western desert (of Iraq)," said one intelligence expert and official who requested anonymity.

Semper Fi