EL-ARISH, Egypt (AP) — Suspected Islamic militants gunned down a Christian man inside his home in northern Sinai, officials and a priest said Friday, the latest in a string of sectarian killings there that has sent hundreds of Christians fleeing and raised accusations the government is failing to protect the community. [...] Egypt's Islamic State group affiliate, which is based in the Sinai Peninsula and which in December carried out a devastating suicide bombing against a Cairo church, vowed in a video earlier this week to step up attacks against the embattled Coptic Christian minority. The displacement underscores what many rights activists said the failure of the Egyptian government in providing the minimum level of security to the Christians in this volatile region of northern Sinai, where the military has been battling for years against militants. Youssef Tawfiq said his father Gamal, a teacher, was shot to death on Feb.