A bar that sold alcohol to underage drinkers could have its licence reviewed.
The White Horse in Southsea Terrace, Southsea, was among five venues caught out in a police sting.
The pub is the first in Portsmouth caught selling alcohol to under-18s twice in three months since police were given new powers to tackle underage drinking. Officers can now act if a licensed premises sells alcohol to children twice in the period instead of three times.
Sergeant Wendie Douglas said: 'We will work with The White Horse while consideration is given to a review of its licence, a summons to court or offering a 48-hour closure notice.'
Other bars that failed the operation on Saturday – in which plain clothes police accompanied under-18s to see if they could buy alcohol – were All Bar One and Bar 38 at Gunwharf Quays, Terrace Bar in Guildhall Walk and The Trafalgar in Edinburgh Road.
Sergeant Douglas added: 'I cannot stress enough to bar workers how important it is to challenge anyone who looks under 25.
'If you don't, you put your licence and your job at risk.'