Robert Downey Jr unsure about fourth `Iron Man`

Los Angeles: Actor Robert Downey Jr is uncertain whether there will be a fourth part to the "Iron Man" series, despite the fact that "Iron Man 3" has reportedly minted 32 million pounds.

"Right now the future is uncertain but I think it`s very important that we end this first Marvel phase in a way that is definitive and has people asking questions," express.co.uk quoted Downey Jr as saying. "When the first one came out people said they appreciated how witty it was and so we`ve tried to keep up that tradition," said the 48-year-old, who portrays the role of Tony Stark in the movie. IANS