Four men from protestant backgrounds among those arrested in Caldwell attempted murder probe
A number of those arrested over the attempted murder of a senior police officer in Omagh are from a protestant background who have links to dissident republicans, police have said.
The PSNI is working on the assessment that the gun attack was the work of the New IRA.
Assistant Chief Constable Mark McEwan made the remarks to the Policing Board after being questioned over the possibility of loyalist involvement in the attack on Detective Chief Inspector John Caldwell.
Police have made a number of arrests and three men remain in custody.
Sinn Fein board member Gerry Kelly asked Mr McEwan for an update on the investigation.
Mr Kelly said it had been a "bit confusing" as there had been reports of arrests in the nationalist/republican community as well as unionist/loyalist area.
Mr McEwan said: "We know there is speculation about the motivation behind the shooting incident because of the community background of some of the people who have been arrested.
"We are very clear that this is still assessed as being an attack carried out by the New IRA and that is where the primary focus of the investigation is."
Mr Kelly said it was believed that four of the people who had been arrested were from a loyalist background and asked if there was a loyalist connection to the shooting.
Mr McEwan said people should not get "confused" with titles such as loyalism.
He added: "We still assess that this has been an attack carried out by the New IRA who have very explicitly stated that they wish to carry out attacks on police officers and John has been the target on this occasion."
Chief Constable Simon Byrne thanked board members and the public for their messages of support, which he said had been relayed to the immediate family of Mr Caldwell.
Simon Byrne said: "We have made numerous arrests.
"I've been out myself three times to Omagh for various reasons to see first hand what is going on and to see John's family, and to give them every support.
"It has been quite tremendous the effort that has gone into the determination to catch the people who did this, both from those investigators who are dealing with the immediate aftermath, the crime scene investigators who help us piece together the evidence bit by bit, and also the determination of colleagues from across the country, many of whom knew John, to do their bit.
"We have had messages from all over the world extending people's thoughts to us and John's family.
"He remains critically ill in hospital, but he is in good care.
"We are ensuring that his wife and son have every possible support from the organisation."
Want a quick and expert briefing on the biggest news stories? Listen to our latest podcasts to find out What You Need To Know.