witnessed
v.v. to see something happen, especially a crime or an important event. You use this when you were actually there to see it with your own eyes.
v. to see an event, typically a crime or accident, take place; to be present as an observer. Transitive — requires a direct object representing the event or action observed.
Several people witnessed the accident on the main road.
The security guard witnessed the entire argument but chose not to intervene until the police arrived.
Historians note that the city witnessed a period of unprecedented cultural growth following the establishment of the university, as documented by those who lived through the era.
The verb is transitive and takes a direct object. It is often used in the passive voice in legal or formal reporting.
I witnessed about the crimeI witnessed the crimeWitnessed is a transitive verb and does not take the preposition 'about' when describing the event seen.