Air cargo security under scrutiny

The US and allied governments are tightening their scrutiny of air cargo and shipped packages and American counterterrorism officials are asking consumers and businesses to look out for suspicious mail that could contain dangerous substances. All this is in response to two mail bombs that were discovered on cargo planes in the United Arab Emirates and Britain on Friday. The bombs were addressed to a synagogue in Chicago. The BBC’s Security Correspondent Gordon Corera joins us from London.