COLOMBO - The military says a female suicide bomber blew herself up at the main railway station in Sri Lanka's capital of Colombo today, killing at least 10 people and wounding dozens of others.

A spokesman, Brig. Udaya Nanayakkara, says it appears the target was civilians because the woman detonated her explosives as she got off the train.

He blames separatist Tamil Tiger rebels for the attack.

A doctor at Colombo National Hospital says 93 people were wounded, 10 of them seriously.

The explosion comes a day after a bomb on a bus killed 18 people, mostly Buddhist pilgrims, in the central town of Dambulla, about 150 kilometres northeast of Colombo.

Earlier Sunday a grenade exploded at a zoo on the outskirts of Colombo, wounding at least four people.

Tamil rebel suicide bombers, known as Black Tigers, have undertaken more than 240 suicide attacks in the separatist group's near-25-year campaign. The United States, European Union and India all list the Liberation Tigers of Tamil Eelam -- as the insurgents are officially known -- as a terror group.

The rebels have been fighting since 1983 for an independent homeland for Sri Lanka's ethnic minority Tamils after decades of being marginalized by Sinhalese-dominated governments. The fighting has killed more than 70,000 people.

More than 700 people have been killed in intensified violence since the government withdrew from a ceasefire with the separatist Tamil guerrillas last month. Civilians have borne the brunt of the violence.