Relatives and friends bid farewell at a memorial service in Tokyo to the seven Japanese victims of last month's terrorist attack in Bangladesh, with Prime Minister Shinzo Abe and other government officials in attendance.

The ceremony was held Tuesday, a month after the attack in Dhaka left 20 people dead, including the seven Japanese aid workers involved in a project for the Japan International Cooperation Agency.

JICA President Shinichi Kitaoka vowed during the ceremony to strengthen safety measures in cooperation with the government, according to the aid agency. The event, which was closed to the media, was attended by around 900 people, JICA said.