On October 28, 2015, Metrojet Flight 9268, a Russian commercial flight, crashed in the Sinai Peninsula shortly after taking off from Sharm el-Sheikh. The plane was brought down by a bomb placed by ISIS-affiliated militants, killing all 224 people aboard. The attack was one of the deadliest terror-related disasters in modern history and prompted worldwide security concerns. The bombing also led to changes in airport security protocols, especially for flights to and from the Middle East. The tragedy had a profound impact on Russia, which increased its airstrikes in Syria in retaliation.