Detective Chief Inspector John Caldwell remains critically ill after the attack in Co Tyrone on Wednesday night.

He was shot in front of his young son at a sports centre where he coaches a youth football team and police believe the two gunmen involved fired multiple shots.

The Police Service of Northern Ireland (PSNI) said on Saturday night that they have arrested a 71-year-old man in Omagh under the Terrorism Act.

The man will be questioned by detectives at Musgrave Serious Crime Suite.

Five other men - aged 22, 38, 43, 45 and 47 - also arrested in connection with the attempted murder remain in custody.

Earlier on Saturday, the PSNI said they had been granted more time to question four of them.

A PSNI spokesperson said a Belfast court had granted an extension to the detention of four male suspects, aged 22, 38, 45 and 47, until 10pm on Tuesday 28 February.

Police have said involvement of the dissident republican group the New IRA is their primary line of inquiry.

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Crowds rally against paramilitary violence in Northern Ireland
Police: 'children ran in sheer terror' after officer was shot

Meanwhile, hundreds of people gathered to demand an end to paramilitary violence in Northern Ireland.

The main street of Omagh was brought to a standstill on Saturday as crowds assembled in front of the courthouse for a rally in solidarity with Mr Caldwell.

Standing a short distance from where a 1998 dissident republican bomb killed 29 people, including a woman pregnant with twins, they held posters saying: "No going back."

Earlier, Beragh Swifts, the football club at which Mr Caldwell is a volunteer coach, led a solidarity walk through the village of Beragh on the outskirts of Omagh.