Singapore has stepped up security in the wake of the Paris attacks.

Home Affairs and Law Minister K. Shanmugam yesterday also urged people to be on the alert.

"These attacks show that no country is immune, even when there is a state of heightened security. In Singapore, today, we have raised our alert level. We have stepped up security measures, border checks and vigilance," he said in a statement.

"Together, everyone plays a part to keep Singapore safe and secure. We encourage everyone to remain vigilant and report any suspicious activities or persons to authorities."

Defence Minister Ng Eng Hen, in a post on Facebook, said that Singapore air force personnel in France were safe and taking extra precautions.

"We have also stepped up vigilance at our local camps, especially at our naval and air bases. Our security agencies are monitoring the situation closely. Let's all be vigilant and keep each other safe," he wrote.

The Ministry of Foreign Affairs has received no reports of Singaporeans directly affected by the attacks and, along with the Singapore Embassy in Paris, has managed to get in touch with most of those who have registered their presence in the French capital.

The ministry urged Singaporeans residing in and travelling to Paris to stay indoors, monitor local news and heed the instructions of the local authorities.