A security alert is under way in both the UK and the US after reports of a suspicious cargo package at a British airport. Parts of East Midlands Airport were sealed off after an alert was sparked at 0330 BST (0230 GMT) on Friday. Investigations are underway on cargo planes at Newark in New Jersey, and Philadelphia. The planes in the US were taken to remote locations to be searched. The suspicious package in the UK was believed to be on its way from Yemen to Chicago. It was reported to be an ink toner cartridge that had been tampered with. But reports quoting US officials said initial tests had proved negative for explosives. It was reported that at least one of the cargo planes being searched in the US was a UPS jet at Philadelphia. "Out of an abundance of caution the planes were moved to a remote location where they are being met by law enforcement officials," the TSA said. A UPS courier truck in New York was also being investigated. But there has been no confirmation as to whether it is linked to the airport checks. Source: BBC