Rescuers searching islands ravaged by a tsunami off western Indonesia raised the death toll to 343 Thursday as more bodies were found and said the number is likely to climb higher because hundreds of missing people may have been swept away.

Elsewhere in Indonesia, the volcano that killed 33 people this week began erupting again, though there were no reports of new injuries or damage. Mourners held a mass burial Thursday during a lull in Mount Merapi's rumblings.

President Susilo Bambang Yudhoyono was to meet Thursday with survivors of the twin catastrophes, which struck within 24 hours in different corners of the seismically charged region, severely testing the nation's emergency response network.

Officials say a multimillion-dollar warning system installed after a monster 2004 quake and tsunami broke down one month ago because it was not being properly maintained.

In the tsunami-ravaged Mentawai islands, search and rescue teams - kept away for days by stormy seas and bad weather - found roads and beaches with swollen corpses lying on them, according to Harmensyah, head of the West Sumatra provincial disaster management center. [ MYWAY NEWS ]