Hasina's Political Secretary Saber Hossain Chowdhury said a postal mail that was received yesterday, carried the threat. It was marked "Congratulation Letter".

But inside, a letter in English read 'Ready to die at any time like your father and mother at House 32.'

It continued: "Sheikh Hasina, we are around you and waiting of your movement with our bomb. We will kill U at Shudha Sadan or any of your meeting places. Very soon we will do our operation. After your death all of your group members will killed (sic)."

The letter also read, 'Don't blame the government for this'.

The letter seemed to have been typed in a manual typewriter, the AL sources said.

The AL leaders yesterday expressed grave concern over the repeated death threats to the former prime minister.

"We can't take anything lightly in this situation. We'll lodge a general diary and officially hand over a copy of the threat letter to the government on Saturday," Saber told The Daily Star.

This is the third time the opposition leader received a death threat.

The first death threat was issued on July 5 this year while she was visiting Istanbul. Then after August 21 attempt on her life, another death threat had been sent by an e-mail to Bangla daily Prothom Alo.