Police and Home Ministry officials said at a news conference that they have arrested three men for the January 29 shooting of lawyer Ko Ni and are seeking a fourth.
Ko Ni had advised Myanmar leader Aung San Suu Kyi on constitutional law, including how to wrest power from the army and put it in the hands of her elected civilian government.
His actions raised suspicion of vengeful military involvement in his killing.
Home Affairs Minister Lt Gen Kyaw Swe acknowledged that many aspects of the Ko Ni murder case still need investigation, but that the authorities now believed that it was personal reasons and extreme nationalism that led the suspects to carry out the assassination.
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In their briefing to the press, police said the murder plot was hatched around April last year, when its alleged planners were talking at a tea shop.
They allegedly hired an ex-convict, Kyi Lin, to be the gunman, reportedly paying him almost USD 60,000. He was captured right after shooting Ko Ni at Yangon's airport.
The officials at the news conference sought to quell speculation that the army was involved in Ko Ni's murder, saying that was a misimpression fostered by several of the suspects being retired officers.
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