The assailant slashed at passersby with a knife and was quickly subdued by police.
Tips
register
Strongly violent. 砍杀 is the standard word for news reports of knife/sword attacks (持刀砍杀) and for the gaming subgenre 砍杀类游戏 'hack-and-slash games'. For ordinary 'to kill' use 杀 or 杀害 - 砍杀 specifically implies a chopping bladed weapon.