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Weliamuna is also the executive director of the Sri Lanka branch of Transparency International, an anti-corruption watchdog body.
A grenade was thrown into the upper floor of Weliamuna's house Saturday night but no one was injured.
Another grenade was found on the premises.
The US embassy in Colombo said it commended Weliamuna's work "as a defender of those who seek to fight corruption, protect the victims of abuse, and advance the cause of human rights in Sri Lanka.
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"We look to the authorities to launch an immediate investigation into this act of violence and bring the perpetrators of this crime swiftly to justice," the embassy said in a statement.
Sri Lanka's Free Media Movement, and the Hong Kong based Asian Human Rights Commission (AHRC) had also condemned the attack.