Suspicious Powder Found at U.S. Embassy in Malaysia  KUALA LUMPUR (Reuters) - Suspicious white powder has been  found in an envelope that arrived at the U.S. embassy in  Malaysia and three staff members quarantined, an embassy  official and police said on Monday.  "A letter was delivered that had a suspicious powder in it,"  said an embassy spokesman in Kuala Lumpur. "The powder is being  sent for testing."