Police have launched a second investigation,, into Thursday's security scare at Piarco International.. involving an aircraft with explosives.<br />The plane and crew have already left... having been cleared.. as law enforcement determined.. that no laws were broken.<br />Now, police say.. a separate national security investigation is underway... into how the plane was allowed to land in the first place.. without the required prior authorization.<br /><br />Alicia Boucher has the story.<br />
