A 16-year-old boy has been arrested by police investigating the hacking of IT systems at a number of schools in Northern Ireland.
He was detained by the PSNI in the Portadown area in Co Armagh earlier.
The teenager has been released pending further police enquiries.
A search has been carried out.
The police said the arrest was linked to a report received at the start of April from Northern Ireland's Education Authority of "network intrusion activity".
The Education Authority said it now believed that there had been a "targeted attack on a small number of schools which is believed to have compromised some personal data".
It said its priority is notifying the individuals and schools impacted.
The Education Authority said it believed the incident had been "contained".
It said: "Additional security measures were deployed at the beginning of this month on detection of the incident.
"Intensive work continues to ensure schools are fully reconnected to the system and that all impacted systems return to normal."
The Education Authority became aware of the problem on Friday 10 April.
Forensic experts were brought in to examine the situation, and they advised there had been "specific and targeted access of personal data".
The PSNI and the Information Commissioner's Office were both informed.
It said personal information had been accessed at a "small number of schools", before additional security measures were put in place.
The Education Authority said any individuals whose information had been accessed would be informed.
