Police are continuing to investigate an industrial unit off Talbot Way in Small Heath, Birmingham, in connection with a number of terror explosions outside mosques across the West Midlands and the murder of a 75 year-old man in April.
A 25 year-old Ukrainian man was arrested last week following the explosions in Walsall, Wolverhampton and Tipton in the last month.
He was then further arrested this weekend on suspicion of the murder of Mohammed Saleem in April.
A 22 year-old Ukrainian man had been arrested and released without charge. He is now helping the police with their investigation.
West Midlands Police say they are questioning one of the men they have arrested in connection with the Black Country mosque bomb attacks about the death of Mohammed Saleem.
It was the end of April when Mr Saleem was killed as he walked home from evening prayers in the Small Heath area of Birmingham.
The 75-year-old had been stabbed three times in the back.
Late last week officers arrested two men - a 25-year-old and 22-year-old from the Ukraine about the explosions near mosques in Walsall, Tipton and Wolverhampton.
On July 21st a court in London gave counter terrorism officers a further week to hold the two men.
Now the 25-year-old is also being questioned about Mr Saleem's murder - which police are calling a further act of terrorism. Mr Saleem's family have been told of the development.
Karen Griggs reports.
A 25-year-old man from Ukraine remains in custody today in connection with the murder of Mohammed Saleem in Small Heath at the end of April.
He was already under arrest as part of the ongoing counter terrorism investigation into explosions near mosques in Walsall, Tipton and Wolverhampton.
Mr Saleem was walking home from evening prayers in Small Heath in Birmingham on Monday 29 April.
As part of the police counter terrorism investigation into explosions near mosques in Walsall, Tipton and Wolverhampton, one of the people in custody, a 25 year-old man from Ukraine, has been arrested in connection with Mr Saleem's murder.
The murder of Mohammed Saleem now forms part of the wider West Midlands Counter Terrorism Unit Investigation."
Funeral prayers will be said later in memory of Mohammed Saleem, the grandfather from Birmingham who was murdered as he walked home from evening prayers in April.
75-year-old Mr Saleem was stabbed three times in the back yards from his home, near to the mosque on Green Lane on 29th April. A £10,000 reward for information has been offered by Crimestoppers.
Police are following new leads after the murder of a Birmingham pensioner was featured on the BBC's Crimewatch programme last night.
Police are particularly keen to hear from an anonymous male caller who left information surrounding the incident following the show and have appealed for this person to call back.
A team of dedicated police officers are still investigating the murder of Mr Saleem and are working closely with Crimestoppers to gather as much information as possible to help crack the case. Crimestoppers are offering a £10,000 reward for anything that leads to an arrest and conviction.
Detectives investigating the murder of 82-year-old Mohammed Saleem say they are following up information from a number of calls after an appeal was shown on the BBC's Crimewatch programme last night.
Officers are currently assessing the information from calls from members of the public that came in after the programme reconstructed the last movements and attack on Mr Saleem just before 10.25pm on Monday 29 April in Little Green Lane, Small Heath.
The daughter of a pensioner stabbed to death near his home in Small Heath says she feels the police have acted unprofessionally throughout the investigation.
Mohammed Saleem, who was 75, was killed on his way home from evening prayers a month ago. His daugher has also shown ITV News Central threatening letters sent to her brother's gym in the months leading up to the attack.
Detective Superintendent Mark Payne, who is leading the investigation, says West Midlands Police Force is "working around the clock" to piece together the information they have about the crime.
"I want to reiterate how important it is to come forward with any information you may have. You can speak to Crimestoppers anonymously and there are robust plans to support and protect witnesses through the justice system.
Our thoughts remain with the family and friends of Mr Saleem who continue to support our investigation."
£10,000 is being offered as a reward by Crimestoppers for information that leads police to the killer of 75 year old Mohammed Saleem.
He was fatally stabbed as he walked home from the Green Lane Mosque in Small Heath, Birmingham just before 10.30pm on Monday 29th April.