<p>A child cries as migrants cross a river, north of Idomeni, Greece, attempting to reach Macedonia on a route that would bypass the border fence, Monday, March 14, 2016. Hundreds of migrants and refugees walked out of an overcrowded camp on the Greek-Macedonian border Monday, determined to use a dangerous crossing to head north. (AP Photo/Vadim Ghirda)</p>
Macedonia's army and police are detaining hundreds of migrants and refugees who crossed the border from Greece.
More than 2,000 people crossed the frontier Monday, braving torrential rain and rough terrain, after being stranded in Greece by Balkan border closures.
In chaotic scense, the refugees also waded across a fast-flowing river before breaching a break in a border fence to reach Macedonia.