Authorities in Spain and Morocco closed airports Tuesday, as ash from an Icelandic volcano once again disrupts air travel.

Spain's air traffic control agency (Aena) said Tuesday that four airports in the Canary Islands and three airports in southern Spain have been shut down.Morocco closed several of its airports including Casablanca.
The volcano continued belching ash on Tuesday. Officials say they do not know how long the eruption will continue.Volcanic activity has shut down sections of European airspace on-and-off for more than a month.The Spanish Airports Authority, AENA, closed Málaga and Granada/Jaén aiports in Andalucía at 1730 CET tonight because of the volcanic ash cloud from the Icelandic volcano Eyjafjalla.As the cloud moved east, Sevilla Airport was able to reopen in the afternoon, and at 2115 CET Málaga was also re-opened after being closed for nearly four hours.Jerez and La Palma remain closed although Badajoz is now open again. Fuerteventura was closed for the first time at 1900.Earlier flight restrictions in some parts of Spanish airspace between 20,000 and 35,000 feet, led to delays in operations, and allowing only 25% of normal airspace capacity over Sevilla, Madrid and Barcelona, but all these were lifted at 2000 on Tuesday night. AENA noted that the lifting of this restriction would do a great deal to clear the delays, as flights would be able to operate normally and airlines could return to their normal flight paths.