EL-ARISH, Egypt — Egyptian security officials say a former sergeant in the Israeli army has been ordered detained for 15 days for investigation into his illegal entry from Israel into the Sinai Peninsula. The authorities say the 24 year-old unarmed Israeli has been in custody since Friday. They announced the arrest Monday. The officials said Tuesday he is under investigation in the Red Sea resort town of Sharm El-Sheikh for allegedly trying to reach the Gaza Strip through Sinai. They have identified him as Andrew Yaacoub Cheteko. Known in Israel as Andre Pshenichnikov, the Jewish immigrant from Tajikistan made headlines last year when he announced he wanted to move to a West Bank refugee camp in solidarity with Palestinians there. Meanwhile, Palestinians say a raid by Israeli soldiers disguised as vegetable vendors to seize members of a militant group has sparked clashes in the northern West Bank. Residents in Tamoun town say youths are tossing stones and bottles at Israeli troops. — Agencies