Singaporean Norasharee bin Gous, 48, and Malaysian national Kalwant Singh, 31, had their capital sentences carried out on Thursday at Changi Prison Complex, the Singapore Prison Service told CNN in an email.
Their executions came just two months after Singapore hanged a man with intellectual disabilities for drug trafficking and brought the total number of death sentences carried out by the country this year to four.
In a statement released Tuesday, Singapore authorities said Norasharee and Singh -- both convicted of drug trafficking and sentenced to the mandatory death penalty -- had exhausted their legal appeals.
Both men had been on death row for the past six years, while many campaigners called for clemency. Amnesty International Malaysia said in a statement earlier this week that the two executions appear to be part of a new wave of hangings in Singapore.
Both men were sentenced to death in June 2016 according to the Central Narcotics Bureau. Singh had been found guilty of possessing 60.15 grams 2.1 ounces of heroin and trafficking in 120.9 grams of the drug, while Norasharee was convicted of soliciting a man to traffic 120.9 grams of heroin. In Singapore, trafficking a certain amount of drugs - for example, 15 grams 0.5 ounces of heroin results in a mandatory death sentence under the Misuse of Drugs Act, though the law was recently amended to allow a convicted person to escape the death penalty in certain circumstances. In April, Singapore executed Malaysian citizen Nagaenthran K. Dharmalingam, 34, in a case that sparked international outcry after psychologists said he was intellectually disabled with an IQ of 69. In 2009, Dharmalingam was arrested for trafficking 42.7 grams 1.5 ounces of heroin and then convicted and sentenced to death in 2010. Singapore's courts rejected several appeals to overturn Dharmalingan's execution in a case in which his lawyers argued that he should not have been sentenced to death because he was incapable of understanding his actions. Human rights advocates argued that the mandatory death penalty for drug traffickers is an inhumane punishment and put the city-state's zero-tolerance drug laws under scrutiny. Amnesty International's deputy regional director for research Emerlynne Gil urged Singapore to immediately impose a moratorium on executions. Singapore has again executed people convicted of drug-related offenses in violation of international law, callously disregarding public outcry, Gill said. The government of Singapore's persistence in retaining and using the death penalty has only weakened Singapore's image as a developed nation governed by the rule of law, according to a statement by the Anti-Defense Asia Network on June 30.