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The police said in an update at 10pm that the sounds heard across Singapore could be related to planned detonation activities carried out by the Singapore Armed Forces at the Southern Islands that started at 11.45am and ended at 1.30pm.
The police verified the matter with the Ministry of Defence (Mindef) and advised the public not to be alarmed.
Several loud sounds were reported in various locations across the island, including Novena and Yio Chu Kang at about 11.30am on Saturday (Apr 27).
Stompers Iona, Vincent and Jenny alerted Stomp to the sounds.
Iona informed Stomp that she felt her building shake at about 11.30am in Novena.
"I felt my whole building shake but there was no thunder or lighting around," she said.
"Someone in Ang Mo Kio reported the same thing.
"I've never felt anything like it."
Vincent, who lives in Yio Chu Kang, added he heard the loud sounds three times on Saturday.
"It sounded like a big ton dropped," he said.
"I heard the first two after 11am.
"I was working in my house's basement when I heard the third one after lunch.
"It caused my large sliding window to shake."
He described the sound as "deeper than thunder".
In a statement on their Facebook page at about 1.30pm, the police said they are in the midst of determining the cause of the sounds which were heard in Orchard and Bukit Timah as well.
In an update, it said police conducted checks on the ground and nothing incriminating has been found.
No abnormalities and injuries were reported.
The police has requested those with more information about this incident to call their hotline on 1800-255-0000.
They can also submit information online at www.police.gov.sg/iwitness or through the SGSecure app.
All information will be kept confidential, police added.