<span style="color: #222222;">Hundreds of firefighters backed by water-dropping planes and helicopters are struggling for a fourth day today to tackle a wildfire burning through a pine forest on the Greek island of Evia.</span><br />'' <span style="color: #222222;"><br />'' Nearly 400 firefighters, 11 helicopters and 13 planes – including two from Italy and one from Spain sent in following Greece's request for help – fought the blaze which broke out hours before dawn on Tuesday and has ravaged a nature reserve.<br />'' The most active parts of the blaze were far from inhabited areas, burning through dense pine forest in canyons hard to reach by land.<br />''<br />''A state of emergency has been declared in the area, and Greece requested firefighting assistance from other European countries.</span><br />