A youth arrested in Northern Ireland on Monday in connection with a cyber attack on telecoms company TalkTalk last week has been bailed, police said on Tuesday.

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"A 15-year-old youth, arrested in County Antrim yesterday as part of the investigation into the alleged theft of data from the firm Talk Talk, has been released on bail pending further enquiries," Northern Ireland police said.

The attack, which experts said appeared to use well-establish hacking techniques, resulted in the theft of data from among the 4 million customers of the phone and broadband provider.

The investigation was continuing, the police said.

Also Read: TalkTalk hack: All you need to know about the cyber attack

TalkTalk said it had received a ransom demand from somebody claiming to be behind the cyber attack on the British broadband company on Wednesday, which involved the possible theft of the details of 4 million customers.

The attack is potentially one of the biggest and most damaging to hit a British company, and comes after several high profile cases in North America. The details of millions of customers of infidelity website Ashley Madison were leaked in August after a massive cyber assault while Sony Corp's film studios were hit in November 2014.

The attack is the third to hit TalkTalk this year, and experts said it would damage the reputation of the company, which competes with bigger rivals BT, Virgin Media and Sky.