A court in Singapore was told that he included a woman’s personal details in the letters in an attempt to incite harassment against her.

Tan Keng Hwee pleaded guilty to three counts of engaging in conduct that wounded the religious feelings of three Muslim complainants, as well as one charge of harassment involving the woman, identified as C1.

The Straits Times reported that Tan became upset with the woman in September 2025 and devised a plan to provoke mosque staff into contacting and harassing her.

He prepared the letters by purchasing pork, paper and envelopes, and mailed them to seven mosques.

Prosecutors said he knew the inclusion of pork would offend Muslims.

Three mosque-related recipients alerted police after receiving the letters, and the woman also lodged a report after being contacted by one of them. Tan was arrested last September and has been in remand since.

During sentencing, the judge stressed that targeting places of worship could incite religious tension and threaten public peace.

Prosecutors said the case underscored the need to deter behaviour that could undermine Singapore’s multicultural harmony.

“The accused’s actions threaten the very fabric of our multiracial and multi-religious society,” deputy public prosecutor Selene Yap said.

“A clear signal must be sent to deter others from engaging in such anti-social and divisive behaviour.”