I saw a terrorist on the first arrival day in the UK!!

When I arrived in the Heathrow airport, suddenly I heard the silence of police car. At that time, Terrolist in London was very topical issue. Then, when I came to the UK, I encountered the accidient. Many police cars were chasing the bus. I thought hijack happened. But when the hijack arrived, one young boy got off from the bus. And he was hand cuffed. I imagened police could arrest one of the terrorist member. Then, I think I saw the criminal. I think this news is on the first page of the newspaper and also on TV. But next day, I couldn't find any news of it on TV and newspaper. I think I mistook and imagined by myself.