U.K.'s police has arrested an 18-year-old youth from Wales in connection with a cyber attack on telecoms company TalkTalk, the fifth arrest in the case. Police said it searched an address in the town of Llanelli and took the youth into custody on suspicion of blackmail.

TalkTalk said on Oct. 23 it had received a ransom demand from an unidentified party claiming responsibility for the attack.

The four others who have been arrested are suspected of Computer Misuse Act offences and have been bailed pending further inquiries.