BBC
The Greek
government and the UN refugee agency have brought in extra staff and ships to
deal with some 25,000 stranded migrants on the island of Lesbos .
A
processing centre has been also set up on an abandoned football ground to help
the migrants to get to Athens .
A Greek
minister said on Monday Lesbos was "on
the verge of an explosion".
Meanwhile,
hundreds of migrants broke through police lines on Hungary 's
border with Serbia and
started walking towards the capital, Budapest .
The
migrants faced down pepper spray used by police as they broke out of a holding
centre in a cornfield and marched down a motorway towards Budapest . They later agreed to be taken by
bus to another reception centre.