Islamic State’s Egyptian affiliate claimed responsibility on Thursday for a bombing that the army said killed four soldiers near Rafah, a town on the border with the Gaza Strip. Egypt is battling an increasingly brazen insurgency in the Sinai Peninsula that has killed hundreds of police officers and soldiers since the army toppled Islamist President Mohamed Mursi in 2013 after mass protests against his rule. The militant group Sinai Province, which has pledged allegiance to Islamic State, said in a statement posted on Twitter that it had planted the bomb on the road between Rafah and the town of Sheikh Zuweid. Reuters could not independently verify the authenticity of the statement. The Egyptian military had earlier said in a statement that an army officer and three soldiers were killed in the attack.