Silent rally for Kenji Goto

During a Feb. 1 vigil in front of the Japanese prime minister’s official residence in Tokyo, a woman holds a sign bearing a photo of slain hostage Kenji Goto and stating, “Do not make an enemy.”   (Eugene Hoshiko / Associated Press)

Supporters of slain hostage Kenji Goto stage a silent rally near Prime Minister Shinzo Abe’s official residence in Tokyo on Feb. 1  (Kazuhiro Nogi / AFP/Getty Images)

Supporters of slain journalist Kenji Goto hold signs reading “Kenji, You will be alive in our memories” during a silent rally near the Japanese prime minister’s official residence in Tokyo on Feb. 1.   (Kazuhiro Nogi / AFP/Getty Images)

Muslims residing in Japan offer prayers at the Otsuka Masjid mosque in Tokyo on Feb. 1 after a video purporting to show the beheading of Kenji Goto was circulated via social media.   (Shizuo Kambayashi / Associated Press)

A woman holds a sign at a Feb. 1 rally in front of the Japanese prime minister’s residence in Tokyo after news of hostage Kenji Goto’s death. The sign reads, “In memory of Mr. Haruna Yukawa,” another Japanese hostage killed by Islamic State.  (Eugene Hoshiko / Associated Press)