From April-May of last year, violent confrontations took place between the Thai military and "Red Shirt" anti-government protestors in Bangkok, Thailand. As a result of protracted street battles that occurred when the government attempted to disperse the protestors, around 90 people died and around 2,000 were injured. This is the worst violence the Thai capital has seen in nearly two decades. 
According to a Human Rights Watch investigation, "the high death toll and injuries resulted largely from excessive use of lethal force by government security forces, including firing of live ammunition at protesters, sometimes by snipers." In addition, Human Rights Watch found that armed elements within the Red Shirts, colloquially referred to as "Black Shirts", were responsible for some deaths. 
Yingluck Shinawatra, the newly elected Prime Minister, has stated that investigations are ongoing. But, to date, only Red Shirts have been charged with crimes even though the majority of those killed were protestors.

Encourage the Prime Minister to set up a transparent, impartial, and independent investigation to hold those who committed human rights abuses accountable, including members of the security apparatus.

Please take Thailand's obligations under international law seriously and investigate the deaths of last year's political violence in Bangkok.

As you know, ongoing investigations in Thailand have resulted in numerous rank-and-file protestors being detained and charged, but, to date, government forces have not been held accountable. Former Deputy Prime Minister Suthep Thaugsuban was quoted as saying that protestors died because they "ran into bullets". 

These double standards are deeply problematic, and go against Thailand's obligations under international law. Thailand is a party to the International Covenant on Civil and Political Rights (ICCPR), and is currently a member of the United Nations Human Rights Council (UNHRC).

As Prime Minister, you are in a position to ensure that a fair inquiry into this violence is conducted. Please do so immediately.