Two al Shabaab suspects were on Thursday night arrested in Nairobi’s Eastleigh area.
The incident comes on the fifth anniversary of the Westgate terror attack.
The Inspector General of the National Police Service (NPS) Joseph Boinnet has called for public vigilance.
“We wish to inform that whilst every effort is being made to uncover and neutralize such plots, we call on the public to exercise higher levels of alertness and to report promptly anything noted that’s out of the ordinary to the police for immediate action,” he said.
The police have asked Kenyans to continue being vigilant.
“While every effort is being made to uncover and neutralise such plots, we call on the public to exercise higher levels of alertness and to report promptly anything noted,” police said on Twitter.
Last week, security agencies in Garissa arrested two suspected al Shabaab accomplices in Ijara and Liboi towns.
Northeastern commissioner Mohamed Birik said the two are a Kenyan from Gatundu in Kiambu and a foreigner of European origin.
The European was reportedly arrested in Ijara town while inquiring about where to board public vehicles to the border town of Hulugho.
The Westgate Mall attack on September 21, 2013 left 71 people dead among them 62 civilians, five Kenyan soldiers, and four attackers.