Following the bombing of Nairobi's city center on Saturday night, the police department has now warned Kenyans to be vigilant at this time and report anyone or anything unusual among them.
In a post on Twitter, the national police service has asked citizens to assist security forces in dealing with any threat by providing sensitive information.
It also urged Kenyans to resume their normal activities, saying that the two victims of the blast, who sustained minor injuries, received medical treatment and went home.
They said police had launched an investigation by looking at CCTV footage to capture the alleged owner of the explosive device.
On Saturday night, a bomb blast in Nairobi's city center injured two people, according to police officials.
Witnesses say a loud noise was heard in the Odeon area, one of the busiest suburbs and crowded gatherings in downtown Nairobi.
The bomb was hidden in a bag and pushed by a cart.
Nairobi city police chief Philip Ndolo told reporters that a Somali-born man rented a cart and loaded his bag, and when they arrived at the scene, at the intersection of Tom Mboya and Latema roads, the owner of the bag disappeared.
"He tricked the driver of the cart by telling him to wait for him to follow his ID which he forgot ... he did not return and shortly after the explosive inside the bag exploded," said Mr Ndolo.
The blast injured a cart driver and a small businessman who was near the cart. The explosion of the bomber struck shortly after noon in front of a crowd of buses.
The attack comes just days after the DusitD2 luxury hotel was attacked and killed 21 people.
The area has already been cordoned off by police and bombers have arrived at the scene.
The blast comes as police officers issue security warnings to Kenyans.