Hundreds of HDB residents around Pandan Loop called the police, when gun shots were heard in the area.
But it turned out to be coming from the set of local police action film, re:solve, reports Razor TV.
The film re:solve is billed as Singapore's first action crime thriller, and making it certainly took resolve on the part of director Randy Ang.
"I've always liked watching cop thrillers from young and I wondered why no one in Singapore dared to do one. Then I made one and realised how hard it was."
There was a chorus of nos when it came to location filming, especially when firearms were involved.
Ang, 35, said: "My requirements were simple. I wanted to use real guns and bullets and it wasn't easy to get the permits to have explosions and gunfights in this bustling city."
The $1.2 million movie opens in cinemas on Feb 27. In it, Inspector Chen Shaoqiang, played by Taiwan's Chris Lee Chih-cheng, tries to solve a series of daring armed heists and murders.
They appear linked to a botched mission from his Special Tactics Unit days, one which resulted in the death of his mentor Wu Tianle (Sunny Pang).
The cast also includes Taiwan's Mico Chang Wei-chun as well as more familiar faces, including local actors Yuan Shuai, Pamelyn Chee, Zheng Geping and Zhu Houren.