After the devastating serial bomb blasts at Jaipur on Tuesday, Uttar Pradesh police have received a threatening letter of 'bloodshed' by a terrorist organisation.

A computer typed Hindi letter was received by the Government Railway Police in Aligarh on Sunday, which threatened to create havoc in Uttar Pradesh by triggering blasts in trains and other important places in Aligarh and Lucknow.

According to police sources here, the name of the terrorist organisation Jaish-e-Mohammad was written at the end of the letter.

Meanwhile, police officials are investigating the matter.