Washington - Two men pleaded guilty on Tuesday to conspiring to provide material support to Sri Lanka's Tamil Tigers rebel group on the eve of their trial in a US district court, the justice department said.
Thiruthanikan Thanigasalam, 40, and Sahilal Sabaratnam, 29, pleaded guilty in Brooklyn, New York to conspiring to purchase guided anti-aircraft missiles for the Liberation Tigers of Tamil Eelam (LTTE), which the US designates as a foreign terrorist organisation.
On Monday, co-defendants Sathajhan Sarachandran, 29, and Nadarasa Yogarasa, 54, pleaded guilty to similar charges.
Thanigasalam, Sabaratnam and Sarachandran face a 25-year sentence to life in prison, while Nadarasa faces up to 30 years prison.
The four defendants were arrested on Long Island, New York in August 2006 after three from the group were accused of negotiating with an undercover FBI agent to buy and export military equipment for the Tamil Tigers.
The equipment included heat-seeking anti-aircraft missiles and launchers, and 500 AK-47 assault rifles.
The United States considers the LTTE a terrorist organisation.
Sri Lankan troops captured the last Tamil Tiger stronghold of Mullaittivu on Sunday, which observers predicted will force the rebels to return to guerrilla warfare tactics.
Sri Lankan President Mahinda Rajapakse has said that his troops are on the verge of victory and that he only accept unconditional surrender from the Tigers.
At least 70 000 people have died in the conflict that has pitted successive governments against the separatist Tamil rebels since 1972. - AFP