http://news.bbc.co.uk/2/hi/south_asia/4153473.stmIndonesian soldiers in tsunami-stricken Aceh province say their relief work is being hampered by attacks from separatist guerrillas.
A ceasefire in the long-running conflict had been declared but now appears to be under strain.
US Secretary of State Colin Powell has warned Indonesia that military equipment provided for relief work should not be used against rebels.
UN Secretary General Kofi Annan is due in Aceh on Friday.
The region, at the northern tip of Sumatra island, was worst-hit by 26 December's earthquake and waves.
Across a dozen nations, more than 140,000 people died in the disaster, and many hundreds of thousands are homeless.
The BBC's Jonathan Head in the provincial capital Banda Aceh says Indonesian soldiers have complained that the insurgents have attacked them even while they are trying to help local people.
Despite losing thousands of their colleagues in the tsunami, there are still huge numbers of heavily armed troops all over the town and on the roads outside.
It is testimony to the massive military presence that was already here fighting the Free Aceh Movement, says our correspondent.
The continuing conflict could pose difficulties for the aid agencies when they start establishing operations outside Banda Aceh, bringing them close to rebel strongholds.
Until now the military has allowed foreigners almost complete freedom of movement since the disaster but it could re-impose restrictions if the conflict flares up again.
Sri Lanka tensions
Tensions are also resurfacing in Sri Lanka, where both Mr Powell and Mr Annan are due on Friday for separate visits.
Tamil Tiger rebels who control the country's north-east accuse the government of failing to provide adequate relief to the area.
Mr Powell and Mr Annan will visit some of the areas of Sri Lanka ravaged when the huge tsunami waves swamped the southern and eastern coastlines.
The secretary general will meet government leaders and tour a Red Cross camp in the southern town of Galle, where hundreds of displaced people are sheltering.
The BBC's Frances Harrison says the disaster now looks likely to exacerbate ethnic grievances in Sri Lanka rather than help overcome them.
Cash plea
At a donors' conference in the Indonesian capital Jakarta on Thursday, Mr Annan said there was a "race against time" to prevent another sharp rise in the death toll.
He appealed for donor nations to convert $1bn of the pledges of aid - which now total about $4bn - into hard cash for immediate relief operations.
The $1bn programme would include $215m towards food, $222m toward shelter and $122m towards healthcare.
Japan was one of the first nations to respond to Mr Annan's appeal, allocating $250m of the $500m it has pledged to the programme.
The conference delegates also backed the setting up a tsunami warning system, and welcomed an initiative to freeze debt repayments by the countries affected.
" JG
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