"We have detained a college student last night for questioning," a police spokesman said today, a day after the machete-wielding killers hacked to death USAID staff Xulhaz Mannan and his friend Mahbub Tonoy, a university student.
Senior Assistant Police Commissioner Shibli Noman said that police found a bag used by the assailants which appeared as "important evidence" in investigating the case.
"Police ASI Momtaz Ahmed chased the killers and managed to snatch a bag from them as they were fleeing the scene --- during the scuffle the officer was also injured," Noman said.
Mannan, a cousin to former foreign minister Dipu Moni, also edited 'Roopban', the first magazine in Bangladesh that advocates the gay rights.
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Dhaka police's joint commissioner Krishnapada Roy earlier told PTI that the pattern of killings of the two activists suggests the incident was carried out by suspected Islamists.
The killing of Mannan, who had worked at the US embassy in Dhaka, prompted US Ambassador Marcia Bernicat to ask Bangladesh in the "strongest terms" to apprehend the killers.
"Everybody knows who were behind such killings...The BNP-Jamaat nexus has been engaged in such secret and heinous murders to destabilise the country," she said.
Witnesses said a group of youths, clad in T-shirts and jeans, carried out the murders and also attacked and injured a security guard with sharp weapons.
They said the attackers had fled the scene after firing from their guns and shouting 'Allah-o-Akbar' (God is great).
Last year, four prominent secular bloggers were killed with machetes, one inside his own home.