A third cache of bombs has been discovered in his home town.Those attacks and a Minnesota stabbing by a Somali-American whom police said made "references to Allah", also on Saturday, have thrust security fears into the heart of the US presidential election, which is less than 50 days away.Federal investigators released a mugshot of 28-year-old Ahmad Khan Rahami, saying he was last known to be living in Elizabeth, a town next to Newark International Airport."Should be considered armed and dangerous," they warned as SMS alerts were sent to millions of people in New York, where President Barack Obama and other world leaders were attending the UN General Assembly.New Jersey police said Rahami was wanted for questioning in connection with both Saturday morning's Seaside Park pipe bombing, which forced the cancellation of a US Marine Corps race but caused no injuries, and Saturday night's bombing in New York's Chelsea neighbourhood, which injured 29 people.The discovery overnight of a cache of bombs, which the FBI defused at the railway station in Elizabeth, led to suggestions that the cache is linked to the two attacks in New Jersey and in Manhattan, where a pressure-cooker bomb was defused. The release of Rahami's name is the first breakthrough in the investigation since the Chelsea bomb detonated, damaging buildings, shattering glass and sending shrapnel flying across the street. - AFP ..