Sixteen American citizens in Europe received mail containing white powder . Tests show powder harmless in most cases ; investigation pending in 16th case . U.S. Embassy official in Madrid : ` ` We know where the package is coming from ''
Sixteen U.S. embassies in Europe receive mail containing white powder . Tests show powder harmless in 15 cases ; results pending in 16th case . U.S. embassy official in Madrid : `` We know where the package is coming from ''