LONDON (AP) - Volcanic ash from Iceland's volcanic eruption is causing further travel problems worldwide.
Polish officials are concerned that the ash cloud could threaten the arrival of world leaders for Sunday's scheduled state funeral for President Lech Kaczynski and his wife.
Among the leaders traveling to Krakow are President Barack Obama, German Chancellor Angela Merkel and Russian President Dmitry Medvedev.
The European Air Traffic Agency says only 11,000 of today's 28,000 regularly scheduled flights are expected to operate. Eurocontrol officials say delays will continue at least into tomorrow as the ash cloud moves south and east at an altitude of 20,000 to 30,000 feet.
British Aviation Authorities have extended a ban on flights over England and Wales into tomorrow morning but say restrictions over Scotland and Northern Ireland are being lifted.
Travelers are turning to ground transportation to get around. A spokeswoman for a Dutch train company NS Hispeed says additional trains have been put into service.
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