The plot, which was revealed in a leaked memo obtained by Khaosod English, was marked as “Secret” and allegedly issued by the intelligence unit of the Royal Thai Police Special Branch.The memo claims to cite information obtained by the Russia’s Federal Security Service or FSB.A source from Thailand’s Tourist Police who spoke to Thaivisa.com on the condition of anonymity revealed how senior officers were told of possible plots to target foreign tourists in Thailand.The source told Thaivisa that a briefing was held early on Thursday, prior to the leaking of a memo to the press.During the briefing, officers were told of plots to target foreign tourists in Bangkok’s Khao San Road, as well as on Walking Street in Pattaya.Senior officers were told how security will be increased at major locations across the country and that Immigration will be stepping up the screening of foreigners at all border checkpoints, something which has been officially announced earlier this afternoon.On Friday police were urging members of the public to remain calm over the alleged terrorist threat.Metropolitan police commissioner Pol Lt Gen Sanit Mahatavorn said on Friday it was still unclear if the leaked memo was genuine and said that a forged document of this kind could have been made public in order to try and incite public disorder and harm the Thai economy.