Kenya deployed heavily armed police officers around key installations on Tuesday in response to twin suicide bomb blasts that rocked Kampala.
At least six people were killed and hundreds injured in the Ugandan capital.
One blast was near Parliament, the other near the Central police station.
National police spokesman Bruno Shioso told the Star they have heightened security, putting in place multiple operations to mitigate any threat.
“We are alert at the border in case those behind the incident try to flee here. Locally, we are also on alert in case of any planned incident,” he said on the phone.
While we’re on high alert to safeguard residents and properties, we encourage the public to be watchful of any suspicious persons and activities within their neighbourhoods and report them
Police spokesman Bruno Shioso
Kenyan authorities have also activated intelligence agencies to c
check on their contacts on the threat level.
Police ‘checked on the activities’ of known Kenyan cells to establish the level of threat, officials said.
Shioso said they had activated security at installations across the country and heightened security within urban areas and along borders.
“While we remain on high alert to safeguard residents and their properties, we encourage the public to be watchful of any suspicious persons and activities within their neighbourhoods and report the same,” he said.
The twin Kampala blasts were suicide attacks, Ugandan authorities said.
In the first blast, CCTV footage shows a man with a black bag detonating himself while the second one was carried out by two suicide bombers on motorcycles.
The explosions happened three minutes apart, between 10:03am and 10:06am.
Uganda police said preliminary findings had shown the Allied Democratic Forces could be behind the attack. They are Ugandan rebels working with IS in DR Congo.
The group has been staging attacks there, prompting neighbouring countries to send troops there to fight the terrorists.
The suicide attackers used improvised explosive devices made from readily available materials in the markets, police said.
A fourth suicide attack suspect was arrested and an unexploded suicide jacket recovered, Ugandan police said.
Some of the injured are in critical condition, Ugandan commissioner of police and spokesperson Fred Enanga said.
The attack comes exactly a month after UK government warned Uganda of a possible terror attack.