Vietnam authorities have jailed 15 people for a foiled terrorism plot to detonate petrol bombs at the country’s busiest airport ahead of a national holiday, Channel News Asia reported on Thursday. They were behind terrorism attempts to explode the Tan Son Nhat airport, setting fire on a parking lot housing impounded vehicles of a police station in southern Vietnam in April this year, and many other failed attempts. Vietnam has declared a US-based activist group Viet Tan or Vietnam Reform Party a terrorist organization and warned that any Vietnamese found to be involved with the group would be regarded as co-conspirators and punished.