Hundreds of migrants stuck at a Budapest railway station for days have set off on foot, saying they intend to walk to Austria.
Hungarian authorities are trying to contain thousands of people desperate to reach western Europe.
According to BBC News, it is unclear how many people are attempting to reach Vienna on foot.
Meanwhile European Union states are struggling to agree a common strategy to deal with the crisis.
Head of the UN refugee agency, Antonio Guterres, said EU nations must mobilise “full force” and accept up to 200,000 refugees.