Cambodian Police Authority has arrested a Thai engineer for allegedly spying for Thailand and sent him to court, police official said on Friday. 'We have already sent him to court and the court will deal with this issue,' Kieth Chantharith, spokesman for Cambodia National Police Authority told Xinhua. But he did not elaborate in details about this issues. The Thai man named Siwarak Chothipong in Khmer, 31, worked as a engineer in CATS, was arrested on Wednesday according to the arrest warrant of prosecutor of Phnom Penh Municipality Court, the Khmer language newspaper Rasmei Kampuchea reported. He spied through copying the letters of flights of former Thai Prime Minister Thaksin Shinawatra in Cambodia and Prime Minister Hun Sen from CATS - Cambodia Air Traffic Services Co Ltd which has duties to control all flights in country...and he sent those reports to Thailand, the newspaper said. 'We decided to charge this Thai citizen and his subordinates of doing things which affected the public security of the country,' Sok Roeurn, prosecutor of Phnom Penh court was quoted as saying. Relations between the two neighboring countries were further strained recently after Cambodia named Thaksin as its economic adviser on Nov. 4. Thailand recalled its ambassador on Nov. 5, and Cambodia followed suit. Thaksin was ousted in a 2006 military coup for alleged massive corruption and other charges. His supporters say he should be pardoned and returned to power. Since the coup, Thaksin has lived abroad to escape a corruption conviction and two-year prison sentence. Thaksin arrived here on Tuesday. After his arrival, Thai government asked Cambodia for 'provisional arrest for the purpose of extradition of former Prime Minister Thaksin Shinawatra, but was turned down by the Cambodian government saying it 'considers the prosecution and legal process against Thaksin Shinawatra a politically motivated proceeding.'' 