An internal message has been sent to News International employees confirming that two of those arrested are journalists currently working for The Sun.
The pair have been provided with lawyers.
More top news
Fine start to the week for most but turning wet and windy from Wednesday.
Thousands of people have lined the banks of the Mersey to see Cunard's three flagship ocean liners sail down the river.
Claims that surgeons used an old saw found in a cupboard to amputate a patient's leg are being investigated.