The officials, allegedly biased to Jamaat-Shibir leaders, informed them beforehand of the involvement of Rajshahi University (RU) Shibir President Shalehi in the killing to help him go into hiding.

They also provided Jamaat-Shibir leaders with a 'secondary story' of the killing based on 'imaginary information' to save Shalehi, it was alleged.

Meanwhile, Jamaat-Shibir leaders have changed their strategy of chaotic movement, and are now pressurising ruling BNP high- ups to remove police officials investigating the case and to act on the 'second story'.

After February 26, they did not hold any programmes on the campus or in any city areas to speak for Shalehi, but they are lobbying with BNP high-ups.

In recent meetings, Jamaat-Shibir leaders claimed that Taher was murdered when he discovered an immoral affair of another teacher of his department at his house on his sudden return to Rajshahi on February 1.

They also demanded immediate arrest of the said teacher and said police recovered a ring and clothing of a woman from near the body of Taher.

But the investigators quoting confessional statements of the arrested killers refuted the Jamaat-Shibir claim.

They said the seizure list does not show any ring and the clothing found around the neck of the body belonged to victim's daughter.

"We are now waiting for the arrest of Shalehi to complete investigation. We have no plan to change the investigation officer as demanded by Shibir, because the plaintiff of the case as well as RU authorities have no objection to the investigation", said a police source.

"Our investigation followed suspected killers' statements and collected evidences," said Rajshahi Police Commissioner Nayeem Ahmed.

"None can change the findings of the investigation as all documents and evidences have been brought to knowledge of the court," he added.