A man stands in front of the Saturday explosion site in Istanbul, Sunday, March 20, 2016. A suicide attack on Istanbul's main pedestrian shopping street Saturday killed a number of people, including two dual nationality Israeli-Americans and one Iranian citizen, and wounded several dozen others, in the sixth suicide bombing in Turkey in the past year.(AP Photo/Emrah Gurel)

Istanbul bomber identified as militant with links to IS

The attack came as Turkey had heightened security across the country in the run-up to a Kurdish spring festival where Kurds in Turkey traditionally use to assert their ethnic identity and demand greater rights.