The BBC is expected to scrap the remainder of the current Top Gear TV series after allegations that presenter Jeremy Clarkson punched a producer.
The broadcaster said Clarkson, 54, had been suspended after what it called a "fracas" and has confirmed Sunday's episode of Top Gear will not be shown.
It is understood the two final episodes in the series will also be dropped.
An online petition calling for the BBC to "reinstate" Clarkson has been signed by almost 250,000 people.
It was started on Tuesday afternoon by political blogger Guido Fawkes.
Clarkson has not issued a statement, but has been joking on Twitter about films that could replace Sunday's show.
The Sun newspaper, in which Clarkson writes a regular column, quotes him as saying: "I'm having a nice cold pint and waiting for this to blow over." It also quotes a "source close to the star" denying Clarkson punched anyone.
The BBC had announced Clarkson's suspension in a statement which said: "Following a fracas with a BBC producer, Jeremy Clarkson has been suspended pending an investigation.
"No one else has been suspended. Top Gear will not be broadcast this Sunday. The BBC will be making no further comment at this time."
BBC News special correspondent Lucy Manning said sources had confirmed reports the presenter was suspended for "allegedly hitting a producer".
"The incident is believed to have happened last week, but was reported to the BBC on Monday and dealt with on Tuesday," she said.
"The next two episodes of Top Gear will not be broadcast and it's understood that a third programme, the final of the series, is unlikely to be transmitted."
The BBC had no comment to make on a report in the Daily Mirror that named the producer involved in the alleged incident.
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