On Saturday morning on 27 April, residents from places such as River Valley, Novena, Orchard and Bukit Timah reported hearing three loud booming sounds. Residents have said that the loud sounds were like explosions, and it gravely alarmed them.
In response to the reports, the Singapore Police Force said the loud sounds could have come from the SAF's planned detonation activities. Police also said they conducted investigations on the ground, yet "nothing incriminating could be found". Police also reiterated that residents should not be alarmed, as they were no injuries or abnormalities reported.
It was only later verified that the sounds did come from SAF's planned detonation activities, which was carried out at the Southern Islands around 11:45am to 1:30pm. Police could not say why only residents living in affluent parts of Singapore heard the sounds.