A look at the suicide bombings in Turkey since July 2015:

— July 20, 2015: A Turkish national who was an ethnic Kurd blew himself up in in the southern border town of Suruc, killing 33 mostly-Kurdish activists and wounding nearly 100 others in an attack authorities blamed on the Islamic State group.

— Oct. 10, 2015: Twin suicide bombings hit a peace rally outside Ankara's train station, killing 102 people. There was no claim of responsibility but Turkish authorities blamed the attack on a local cell of IS.

— Jan. 12, 2016: A suicide bomber blew himself up in the historic district of Istanbul, killing 12 German tourists. Authorities said the attack was carried out by an IS-linked Syrian man who had entered the country as a refugee.

— Feb. 17, 2016: A suicide car bomb apparently targeting military personnel in Ankara killed 29 people in an attack claimed by TAK, an off-shoot of the Kurdistan Workers' Party, which Turkey considers a terrorist organization.

— March 13, 2016: A Kurdish woman blew herself up in a car at a busy transport hub in Ankara, killing 37 people in an attack that was also claimed by TAK, also known as the Kurdish Freedom Falcons.

— March 19, 2016 — A suicide bombing rocked Istanbul's main pedestrian street killing five people, including the bomber, whom the authorities identified as a Turkish national linked to IS. Like in the prior attacks blamed on IS, there was no claim of responsibility from the group.