Air traffic controllers in Portugal will stage a series of new partial strikes beginning next week, the latest in a series of actions to protest restructuring, unions said on Friday.

The controllers will stop working for two four-hour periods each day beginning on June 29 until July 3. Previous such strikes in April and May severely disrupted air traffic, with hundreds of flights affected.

The air traffic controllers are protesting at the restructuring of services and budget reductions in the recession-wracked country. They had staged four days of strikes in May and five days in April.