By Ryan Fahey Thrillseekers at a theme park have been left injured after a tree collapsed on a rollercoaster. At least 14 people have been injured after a tree fell on thrill-seekers inside a rollercoaster at a Spanish theme park. Two of the casualties have been airlifted to hospital from PortAventura World and are said to be critical. Those hurt were on a wooden roller coaster called Tomahawk inside the theme park in Salou near Tarragona. The injured include adults and children. The two critically injured victims have been taken to Bellvitge Hospital in Barcelona and Joan XXIII Hospital in Ta…