A gay rights activist and his friend were killed Monday night in Bangladesh's capital, Dhaka, by a group of assailants reportedly armed with machetes and guns.

Their deaths are the latest in "a series of attacks on progressive voices that has deepened anxiety about growing fundamentalism in the tiny Muslim country, which borders India," NPR's Julie McCarthy tells our Newscast unit.

Xulhaz Mannan and a man said to be a close friend were slain by a half-dozen men posing as couriers when they forced their way inside Mannan's apartment, Julie reports.

Mannan worked for the U.S. Agency for International Development and was the editor of Roopbaan , the country's only LGBT magazine, and had helped organize a rally for LGBT youths called The Rainbow Rally on April 14, the Bengali New Year. Another friend of Mannan's, Sara Hossain, told The New York Times that the activist had received death threats from people who opposed the rally.

An al-Qaida-linked group said it was responsible for the two killings. The Associated Press reports that "the claim by Ansar-al-islam — which said it targeted the two men on Monday night because they were 'pioneers of practicing and promoting homosexuality' — raised doubts about Prime Minister Sheikh Hasina's repeated assurances that authorities have the security situation under control."

USAID published a statement following Mannan's death, calling him "a dedicated and courageous advocate for human rights."

"Xulhaz sought to shape a society that was more diverse and inclusive. He believed in the people of Bangladesh, and he strove to make the world a better place for everyone."

The Wall Street Journal spoke with an employee at Mannan's apartment building about what happened there:

"Abdur Rahim, the caretaker of the six-story building in which Mr. Mannan lived, said two young men posing as couriers entered Mr. Mannan's first-floor apartment on Monday evening. Four other men then followed them into the apartment." 'We heard shouts and then loud bangs,' Mr. Rahim said."Mr. Rahim said building guards and a police patrol tried to stop the group as they tried to escape after the killing. The killers escaped by firing shots that injured a policeman and a building guard, Mr. Rahim said."

Mannan and his friend were cut down just days after English professor Rezaul Karim Siddique was hacked to death as he walked to his home in the city of Rajshahi, Bangladesh. Julie reported over the weekend that Siddique may have attracted attention with his focus on cultural enrichment after he organized a music school.

She notes that the latest attacks might signal a shift: "It appears that the assailants may be expanding their range of targets. Previously, the grisly attacks have focused on atheists and bloggers critical of Islamic fundamentalism."

Earlier this month, an atheist law student named Nazimuddin Samad was hacked and shot to death by men on a busy street in Dhaka. Samad reportedly had been named on a "hit list" of bloggers sent to the Bangladesh Interior Ministry by a group of radical Islamists in 2013.

Copyright 2016 NPR. To see more, visit http://www.npr.org/ .