
15-year-old girl also arrested on suspicion of withholding information.
A 16-year-old boy has been arrested on suspicion of murdering Piotr Krowka in Maghera.
The body of the 36-year-old, from Poland, was discovered in a derelict building on the Glen Road on Tuesday April 3.
A 16-year-old boy has been arrested on suspicion of murder and a 15-year-old girl has been arrested on suspicion of withholding information.
Both were detained in the Maghera area on Tuesday morning.
Both remain in custody at this time.