Tech companies operating in Israel are expected to fortify security as they could face disruptions, said investors and analysts, after Hamas gunmen from Gaza killed hundreds of Israelis and abducted an unknown number of others. High-tech industries have for a few decades been the fastest growing sector in Israel and crucial for economic growth, accounting for 14% of jobs and almost a fifth of gross domestic product. Israeli stock and bond prices slid and many businesses were closed on Sunday after gunmen from the Palestinian group Hamas rampaged through Israeli towns on Saturday and militants also fired thousands of rockets into Israel in a surprise attack.