Thai police said 10 plotters were involved in the country’s worst terrorist attack Monday. No one has taken responsibility and the authorities have not blamed any group. The police said the investigation shows the attack was planned at least a month in advance by a “big network.” The 10 plotters included lookouts, those who made the bombs and planted them and those who knew the escape route. “The criminal could be someone inside the country but disguised to look like a foreigner,” said police chief Somyot Pumpanmuang. Nevertheless Thailand has applied to Interpol to find the man on the video.