The email, which was sent Wednesday night to various television channels, has given the frame number (129489) of the bicycle which was planted at Choti Chaupad near Kotwali in the Pink City.

The frame number of a bicycle recovered by the Rajasthan Police from the spot is same, informed sources said, adding the email was written yesterday from a cyber cafe in Sahibabad in the outskirts of the capital.

The email id used was guru_alhindi_jaipur@yahoo.co.uk", the sources said, noting that the account was created on Wednesday itself using the UK domain of the Yahoo.

The email said India should stop supporting the US in the international arena, "and if you do continue then get ready to face more attacks at other important tourist places...".

The email has three video attachments shot by a mobile phone camera, the sources said.

While the first video of three seconds shows a brand new cycle, the two others of four seconds each focus on a new cycle parked in a two-wheeler stand with its carrier having a blue bag purportedly carrying a bomb.

The email said, "Jaipur has been chosen to blow up your tourism structure....".

It also said, "this is a clear warning to you (the US and the UK)...Don't send your people to India and if you do so then you people will be welcomed by our suicide attackers."

It referred to an earlier electronic message sent while the blasts in court premises in three cities in Uttar Pradesh took place in November last year. That email was traced back to a cyber cafe in East Delhi but nothing could be established beyond that, the sources said.

Sources in security agencies said the email could not be taken lightly and there was some link between it and those who had perpetrated the serial blasts in the Pink City on Tuesday that left 63 people dead and over a hundred injured.