Indian Ocean earthquake tests tsunami readiness

The United Nations said a fledgling Indian Ocean tsunami warning system helped spread the alarm after Monday's earthquake:

* In Thailand, radio stations repeated government warnings that the quake could set off another tsunami, and workers in seaside hotels went door to door to wake up guests.

* Along India's Tamil Nadu coast, police used loudspeakers to tell residents to move to higher ground away from the sea.

* In Sri Lanka, officials alerted the media, and police and the military took up loudspeakers to warn coastal residents to get away from the water. Buddhist monasteries played prayers over loudspeakers, awakening those living nearby.