Postal services in Preston have been disrupted by three days of wildcat strikes at a city delivery office.
Postal staff at the Preston Central Delivery Office walked out on Friday. This was after a worker was suspended following an disagrement with a manager.
A Communication Workers Union spokesman said workers also wanted the manager to be suspended while an investigation into the incident was carried out.
The Royal Mail said it was trying to “limit the impact” of the action.
Deliveries in these areas have been affected: PR0, PR1, PR2, PR3, PR4 and PR11 postcode areas of Preston.
Adrian Fielding delivery director for the Royal Mail said he was “urging colleagues to return to work immediately and stop this unnecessary inconvenience to our customers”
He added Royal Mail had “drafted in additional managers who are doing their very best to deliver mail and limit the impact of this industrial action on our customers”.