BANGKOK (AP) 鈥 Thailand's prime minister announced new land border restrictions Monday aimed at blocking tourists heading into Cambodia as the two countries engage in retaliatory measures in their border dispute.

following an armed confrontation May 28 in which one Cambodian soldier was killed in a relatively small, contested territory. While the two sides have they continue to implement or threaten measures that have kept tensions high.

Prime Minister Paetongtarn Shinawatra said Monday that Thailand will boost screening at land borders and block departing tourists, saying that only students, medical patients and others who need to purchase essential goods would be allowed to enter or leave Thailand.

She said the measures were aimed at blocking people heading toward Cambodia's lucrative casinos, but it appeared that all tourists would be blocked.

The Thai army said in a statement later Monday that it had implemented the measures at every land border checkpoint between Thailand and Cambodia in five provinces, and that it was stopping all crossings except for people with essential needs.

Cambodia, for its part, has boycotted some Thai internet services, and blocked electricity and fuel supplies from Thailand in response to the border dispute. Prior to the boycott, Cambodia imported 30% of its gasoline and other fuel from Thailand.

Paetongtarn also said Monday that Thailand will consider blocking exports that could facilitate scam operations in Cambodia and will coordinate with other countries and international agencies to crack down on cybercrime based in Southeast Asia.

Thailand earlier this year aimed at cracking down on online scam operations in neighboring Myanmar, severing electricity, internet and gas supplies to border towns where the scams were based.

Paetongtarn's comments suggested Thailand would soon impose similar measures aimed at similar scam operations in Cambodia.

An named Cambodia as a hub for scam operations in which workers go online to lure victims through false romantic ploys, bogus investment pitches and illegal gambling schemes.

Paetongtarn has been attacked over her perceived soft stance toward Cambodia, especially by right-wing nationalists who are longtime foes of her father, former Prime Minister Thaksin Shinawatra.

A between Paetongtarn and Cambodian Senate President Hun Sen, the former prime minister who ruled Cambodia over four decades, sparked outrage and calls for Paetongtarn鈥檚 resignation.

Critics said she tried to appease Hun Sen, a , and made Thailand look weak by calling a Thai army commander in charge of the disputed border area as 鈥渁n opponent.鈥 Several nationalist activist groups have planned a rally this week to demand Paetongtarn鈥檚 resignation.

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Sopheng Cheang in Phnom Penh, Cambodia, contributed to this report.

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