Security forces investigating a politically motivated mass killing in the southern Philippines have uncovered a hidden cache of weapons.
The discovery was made at a property belonging to a powerful clan which has ruled the province of Maguindanao for most of the past decade.
They are loyal supporters of President Arroyo.
Several members of the Ampatuan family have been detained.
The latest of several weapons caches was found on Sunday. Military officials said about 40 firearms and hundreds of crates of ammunition were discovered.
Fifty-seven people including 30 journalists died in the massacre on 23 November.
The BBC reports 15 people at a ranch owned by the family have been arrested, bringing the total number detained to 62. Maguindanao province is now under martial law.