Attempted murder charge after teen stabbed 30 times on bus at Ingleburn

An 18-year-old male was on a bus when he was stabbed by a man known to him, police will allege.

The violent attack was witnessed by several other bus passengers.

The attack occurred around 1.15pm on November 15, with emergency services called to a bus stop in Ingleburn.

"He was treated at the scene by NSW Ambulance paramedics and taken to Liverpool Hospital in a critical condition," NSW Police said in a statement.

The teen's condition was later upgraded to serious, but stable.

The following day police arrested a 22-year-old man at a bus stop on Eucalyptus Drive at Macquarie Fields.

The man was charged with attempted murder and refused bail to appear at Campbelltown Local Court on Friday, November 17.