Macedonian police have fired tear gas and stun grenades after a few hundred migrants angry at long delays in entering Macedonia broke a gate on the Greek-Macedonian border. The protesters, who were chanting "Open the border!" and throwing stones at Macedonian police, were repelled. Police said 500 people earlier pushed their way past Greek police to reach the gate used to let trains through at the border crossing. [...] with an estimated 4,000 migrants in the slum, the situation in Calais has become a flashpoint for Europe's immigration crisis, fueling far-right sentiment on both sides of the Channel. Police say about 6,500 people are at or near the Idomeni border crossing, with another 500 moved to a hastily erected camp on a small concrete landing strip some 20 kilometers (13 miles) away.