A six-year-old child was among the 25 victims of Wednesday's attack, claimed by a group affiliated with Daesh terror group.
The Multinational Joint Task Force, comprising soldiers from several African countries, says it has "inflicted the heaviest loss in six months" on Daesh in Lake Chad area.
President Maithripala Sirisena orders emergency for another 30 days, citing "public security," a month after deadly Easter bombings killed 258 people.
A splinter group of Boko Haram that pledged allegiance to Daesh is stepping attacks in Nigeria, opening a new chapter in the country's war against terrorism.
At least seven civilians were killed in a suicide bomb attack by Daesh close to the Afghan Ministry of Rural Rehabilitation and Development in Kabul.
A suicide attacker on foot detonated himself in front of Kabul University as Afghans celebrated Nowruz holiday marking the start of the Persian new year. At least 65 people were wounded in the attack.
Two police officials and one civilian were killed when a suicide bomber blew himself up near the main entrance of the Kabul International Cricket Stadium, Afghan officials say.
The knife attack on patrolling soldiers in Brussels came just hours before a sword-wielding assailant wounded police outside London's Buckingham Palace.
Three assailants were also killed following two simultaneous gun and knife attacks near the walled old city. Hamas rejects Daesh claim of responsibility.
Officials say it was not a terrorism incident and that claims of responsibility of the attack by Daesh were false.
Daesh claimed responsibility for the attack which also wounded at least 35 people, including three US troops, when a NATO convoy was targeted in rush hour traffic.
The claim comes hours after on police officer was killed and another two were wounded in a shooting in central Paris.
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