The Philippines' largest Muslim rebel group provided sanctuary and colluded with fugitive Southeast Asian Islamic militants in the country's restive south, government documents showed on Monday.

An intelligence report seen by Reuters details the close links, which Filipino rebel leaders have continued to deny, between the Moro Islamic Liberation Front (MILF) and militants from Jemaah Islamiah.

The report, based on information from captured MILF member Omar Venancio, showed the separatist group sheltered about two dozen Indonesians, a Malaysian and a Singaporean in rebel bases in the southern Philippines -- even at the height of peace talks with the government in 2005.

The revelations raise doubts on the sincerity of the rebels to amicably settle a 40-year conflict that has killed 120,000 people in the south of the mainly Roman Catholic state.

Venancio, 30, who is also known as Abdul Farouk, told military interrogators how he had opened bank accounts and handled funds for Indonesian fugitive militant leader Umar Patek since 2004. He also guided some Indonesians in other parts of Mindanao.

In September 2008, Venancio said he was told by Ustadz Ameril Ombra Kato, a top leader of a rogue MILF faction, that the violence in the south was sanctioned by rebel leaders after a deal with Manila was scrapped by the country's Supreme Court. The report said Venancio met Patek through another rogue MILF leader, Mokasid Dilna, one of few Filipino guerrillas who trained in Afghanistan and Pakistan in the late 1980s.

Both Venancio and Dilna were arrested early this year on the southern island of Mindanao. Through Dilna, Venancio also met another Indonesian fugitive, Dulmatin, and Malaysian bomb-maker, Zulkifli bin Hir, alias Marwan, late in 2005.