A man wielding a knife attacked two Belgian police officers in the capital Brussels on Wednesday but their body armour protected them and they were unhurt, the police said.
Islamic State claimed responsibility on Sunday for an attack by a machete-wielding man in Belgium that left two female police officers seriously injured, the group's Amaq news agency said on Twitter.
Authorities sought to learn more about a decorated ex-US Marine sergeant who killed three police officers in Baton Rouge, Louisiana, some two weeks after police there shot dead a black man.
Three police officers were shot to death and several others wounded in Baton Rouge, Louisiana on Sunday, the city's mayor said, as the country remained on edge in the wake of police shootings of black men and the killings of five Dallas officers.
Dallas was gripped by a new security scare on Saturday triggered by an anonymous threat in the Texas city, on edge days after a gunman fatally ambushed five police officers during a peaceful protest.
Dallas police were in a standoff with a suspect on Friday after snipers killed five officers and wounded six, one of the worst mass police shootings in recent US history, during protests against the killing of two black men by police this week.
Two Britons inspired by Islamic State who plotted to kill police officers and soldiers in drive-by shootings in London were given life prison terms and told they would spend at least 20 years in jail.
