National Disaster Risk Reduction and Management Council chief Eduardo del Rosario said local officials reported that up to 20 climbers and guides, including foreigners, were on Mount Mayon when it erupted.
"Five killed and seven are injured, that is the latest report," del Rosario said. "We do not have the identity of those killed or injured, whether they are foreigners or locals."
He said rescuers could not confirm firsthand the reported casualties until they reached the site.
Marti Calleja, a local tour operator, said his company had sought help to rescue five foreigners who had gone to climb Mayon with his outfit's guides shortly before the explosion.
"It rained like hell with stones. It was sudden and there was no warning," Calleja told AFP by telephone.
The group was trapped about half a kilometre below the crater, Calleja added.
Chief state seismologist Renato Solidum said people living around Mount Mayon did not need to evacuate, describing the event as a "minor steam-driven explosion" of ash deposits at the crater mouth making contact with rain.
"There is no magma activity. Essentially what happened today is a normal process of a steam-driven explosion," Solidum told the television station.
Residents in towns around the picturesque volcano famous for its near-perfect cone said they were surprised by the sudden activity, which came as many were having breakfast.
"It was so sudden that many of us panicked," Jun Marana, a 46-year-old bus driver and father of two, told AFP by telephone.
"When we stepped out we saw this huge column against the blue sky."
The volcano also erupted in August 2006. There were no direct deaths caused by the explosion, but the following December a passing typhoon unleashed an avalanche of volcanic mud from its slopes that killed 1,000 people.
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