Prime Minister Sheikh Hasina has vowed to hunt down and prosecute those who fatally stabbed two men in the capital of Bangladesh, including a gay rights activist who also worked for the U.S. Agency for International Development.

Hasina accuses the country's opposition party and allied militants of orchestrating the killings Monday night. The opposition denied the allegations.

It was the latest in an ongoing wave of attacks claimed by radical Islamists and targeting the country's outspoken atheists, moderates and foreigners.

The victims were identified as USAID employee Xulhaz Mannan and his friend, theater actor Tanay Majumder. Mannan was also an editor of the country's first gay rights magazine.

Police sub-inspector Shamim Ahmed says no suspects have been arrested in the case.

The United States condemned the "barbaric" attacks.