TANAUAN, Philippines - Philippine officials ordered a crackdown on Monday (Jan 20) on people being allowed daily visits to the homes they fled after Taal volcano erupted, citing risks that it could still explode at any time.

Over 110,000 people have taken refuge in evacuation centres since Taal burst to life a week ago, but many hard-hit towns have permitted people in to fetch items, feed livestock and clean up their houses.

"We are directing DRRMCs (civil defence officers)... not to allow anyone to enter the danger zone," said Mr Epimaco Densing, under-secretary for the Department of Interior.

"It's dangerous, that's why we have imposed a lockdown," he told reporters.

The volcano shot ash 15km high in the Jan 12 eruption, which crushed scores of homes and killed livestock as well as crops.

However, seismologists have warned the volcano could imminently unleash a much bigger blast, putting at risk the lives of anyone in the 14km radius "danger zone" that surrounds it.

"The threat remains. It has not waned," Mr Renato Solidum, head of the Philippines' seismological agency, told reporters.

He said the volcano might be spewing less ash that it was a few days ago, but the magma that would fuel a big eruption is still coursing towards it.

Until experts deem the threat has passed, the evacuees will need the shelters spread across some 400 sites that range from school campuses to covered basketball courts.

The authorities say they have so far been able to provide fundamental services to the evacuees, including a place to sleep, eat and wash.

"We can handle the (current evacuee numbers). The issue is how are we going to sustain resources over the longer term," said Mr Alex Masiglat, spokesman for disaster relief in the ground zero Calabarzon region.

"Our concern is how are we going to sustain a long-term evacuation period," he added.

Though no people have been reported killed, the eruption has wreaked havoc on agriculture and tourism.

Taal is set in the middle of a picturesque lake that is a popular draw for tourists, especially because it is a mere 60km south of the hot and crowded capital Manila.