Men held at PMO after suspicious material found

Security guards at Prime Minister Ehud Olmert's office detected a "suspicious substance" Sunday in the shoes of an Arab man trying to enter the building, a spokeswoman said. Sappers took the shoes and carried out a controlled explosion. Four loud booms were heard. Police announced over loudspeakers that visitors were not allowed to leave the building for the time being. The suspect was held for questioning, the prime minister's office said.