Insurgents on Wednesday laid siege to the headquarters of a police paramilitary unit near the capital, lobbing a volley of mortar shells that killed at least one senior officer and wounded at least five, Interior Ministry officials said. In the predawn attack, 14 mortar shells hit a government center in the Sunni-dominated town of Salman Pak, 12 miles southeast of Baghdad; the Third Public Order Brigade, which is overwhelmingly Shiite, had been using the center as a base. Among local Sunni Arabs, the brigade has a reputation for torture and abuse. Full Story