French Prime Minister called for "vigilance" after the country was hit by three bizarre attacks in quick succession, sparking fears of possible copycat action.
New York reeled after the murder of two uniformed cops by a man whom investigators say told bystanders to "watch what I'm going to do" just before the killings.
US President Barack Obama on Sunday "unconditionally" condemned the killing of two uniformed New York police officers who were gunned down in their patrol car in Brooklyn by a lone gunman.
Hong Kong police began dismantling the city's main pro-democracy site and hauling off a hard core of protesters who nevertheless vow that their struggle lives on.
A white police officer shot dead a black man in Arizona when he mistook some pills for a gun amid protests in New York triggered by a string of similar incidents.
Magistrate in Malta has ruled that the criminal complaint against Rakhat Aliyev filed by two Kazakh bodyguards alleging torture cannot be investigated by Maltese police.
A rookie New York police officer remained in hospital in a serious condition after being attacked by a man with a hatchet who was then shot dead by officers.
Mexican authorities have captured the suspected leader of the Guerreros Unidos gang, which was allegedly involved with corrupt police in the disappearance of 43 students.
Protesters occupied three town halls in southern Mexico to demand the safe return of 43 students who disappeared after gang-linked police attacked them.
Kazakhstan has recently introduced changes to the Criminal Code. In this regard, the state will allocate $13 million for electronic tagging devices for monitoring convicts.