Nur Hossain, former Narayanganj City Corporation councillor, has been in jail since 2017 after he was sentenced to death in sensational Narayanganj seven-murder case.
Jail superintendent of Kashimpur central jail-2 Abdul Jalil on Saturday said a three-member committee, headed by deputy superintendent of prisons Umme Salma, was formed to probe the incident.
There are three inmates, including Nur, 50, in the Kashimpur central Jail part-2 condemn cell. Tipped off, the jail authorities recovered a mobile phone set after searching the cell on 5 January, he said.
The other members of the committee are chief jailer Asadur Rahman and deputy jailer Nurul Mobin. The committee has been asked to submit its report by 11 January.
A court of Narayanganj on 16 January 2017 sentenced 26 people, including three sacked RAB officials and ex-city councillor Nur Hossain, to death and nine others to different jail terms in the two cases filed over the murder incident.