Almost 600,000 football fans from 161 countries have registered to buy tickets for the 2012 European Championship on the first day of sales on the Internet.
Juliusz Gluski, a spokesman for the Polish tournament organizers, said Tuesday the sale was launched at 1500 GMT on the UEFA.com website and will continue through March 31.
Fans have the same chance of getting tickets regardless of when they register.
Gluski said about 85 percent of the 1.4 million tickets to the tournament in Poland and Ukraine will be made available to fans worldwide. The rest will go to special guests, sponsors and UEFA and local football authorities.
The high demand Tuesday meant the ticket portal couldn't handle all the traffic, often greeting visitors with a message to try again at a later time.
