US Secretary of State John Kerry spoke Thursday with Syria\'s foreign minister about an alleged chemical weapons attack a day earlier that reportedly killed hundreds of civilians, an American official said. Kerry discussed the purported attack on rebel-held areas near Damascus with Walid al-Muallem \"to make clear that if, as they claimed, the Syrian regime has nothing to hide, it should have allowed immediate and unimpeded access to the site rather than continuing to attack the affected area to block access and destroy evidence,\" the official said Saturday.