Teenagers are among a handful of people who were bashed in separate random attacks in Perth’s southern suburbs overnight.

Two brothers have been left with injuries including a broken jaw and toes after being attacked by a man with a baseball bat at Woodman Point in Munster last night.

Their 18-year-old friend was also set upon in the random attack.

The older brother, also 18, was knocked out cold when he was hit with the bat. He has multiple breaks in his jaw and some teeth were crushed.

His 16-year-old brother tried to run away but tripped on a speed bump. The man swung the bat at him and broke three toes.

“When he saw his (older) brother hit the ground, he thought ‘oh my god he’s dead’ and he had to run for his life. That’s how bad it was,” the brother’s mother Rebecca told Seven News.

She said the young men were waiting for a friend to pick them up after Australia Day celebrations when they were approached by a man saying something about his car, but they could not understand what he was saying.

Rebecca is hoping someone has information to help police.

“You’re able to hold someone accountable for their actions and this is a very cowardly action,” she said.

Play Video Three people have been injured in Perth's south after they were attacked with golf clubs and knives during a home invasion. The West Australian Video Three people have been injured in Perth's south after they were attacked with golf clubs and knives during a home invasion.

Meanwhile further south in Barragup, near Mandurah, three people were left with serious injuries after a violent home invasion.

Police said five men wearing hoods broke into the semi-rural Barragup home about 10.15pm on Saturday.

Armed with golf clubs and knives the attackers set upon a 48-year-old man and his 18-year-old son.

They tried to fight back but were seriously injured with possible facial fractures. They remain at Royal Perth Hospital in a stable condition.

An 18-year-old woman was also hurt in the attack but was released from hospital this morning.

Police said the attackers fled without demanding anything from the victims.

Anyone with information on either incident is urged to contact Crime Stoppers on 1800 333 000.