One other two males have been arrested by detectives investigating the killing of journalist Lyra McKee, police in Northern Eire have mentioned.
The lads, aged 44 and 53, had been arrested within the Derry space on Friday morning below the Terrorism Act.
She was standing close to a police automobile when she was hit by a bullet fired by a masked gunman towards officers.
The suspects have been taken to the Police Service of Northern Eire’s Severe Crime Suite at Musgrave police station in Belfast for interviews.
It follows a further two arrests of two males, aged 24 and 29, on 22 September.
Three males have already been charged with the homicide of Ms McKee and one other 4 have been charged with rioting and related offences.
The extremist group that types itself the New IRA has beforehand claimed it was liable for killing the Belfast journalist and writer.