A man and woman were assaulted by masked raiders while their children slept upstairs.
The four offenders forced their way into a property on Warrington Road in Newtown on Saturday at around 11.30pm and punched the 63-year-old man.
They also assaulted his 42-year-old wife and threatened them with what they described as a large knife before fleeing.
The main offender is described as being white, of slim build, 5ft 8in tall, in his mid 20s, had blond hair, and wore a yellow and blue checked shirt. The other men wore dark clothing and balaclavas.
Detective Constable Brendan Greally said: “At the time of the assault, the victims’ children were asleep upstairs.
“However, one of them overheard the commotion and came downstairs to witness their parents being attacked.
“This was an unprovoked attack and we do not know what the motive was. No property was stolen, the attackers may have panicked and fled.
“The aftermath of the attack has left the family terrified and in fear of the place you should feel safest of all.
“I would appeal to anyone who may have witnessed the men force their way into the house or leave to call us as soon as possible.”
Anyone with information should phone police on 0161 856 7124 or the independent charity Crimestoppers, anonymously, on 0800 555 111.