Bangladesh stepped up its probe into the Dhaka hostage siege Monday as relatives of the seven Japanese victims witnessed their suffering firsthand when they viewed and identified the tortured and disfigured bodies.

The 18 family members, who arrived aboard a Japanese government airplane late Sunday night, were met on the ground by Senior Vice Foreign Minister Seiji Kihara.

Kihara, who is part of a government unit investigating acts of terrorism, said the relatives appeared exhausted and speechless.