Summer heatwave sparks grass fires across Perthshire and Grampian Grass fires have been keeping firefighters busy in some parts of Scotland, as the country continues to bask in the heatwave. The fire service was called to a blaze covering around three acres of grassland near the village of Crook of Devon in Perthshire. Three fire engines attended. Firefighters also attended a blaze on a railway line near Boat of Garten, two miles north of Aviemore in the Highlands. Grass and bushes were ablaze at the side of the track and three fire engines attended, a spokeswoman said. Crews in the Grampian area have dealt with a number of small grass fires in forests and scrubland, a spokeswoman for the fire service said. Meanwhile, fresh health warnings have been issued as the hot weather looks set to continue into Sunday. Health Secretary Alex Neil said: "Young children, older people and those seriously ill are most at risk of developing health problems when the weather is very hot. Those with young children and elderly relatives should take extra care to make sure they have everything they need to stay safe in the sun, and it would be worth checking in on an elderly neighbour to make sure they are safe and well. The heatwave is believed to have caused up to 760 premature deaths across the UK already. Mr Neil added: "It is important that people drink plenty of water to stay hydrated, protect their skin with SP factor 15 or above and take shade during the hottest parts of the day. We don't often get such nice weather in Scotland and we all want to enjoy the summer while it lasts - so make sure you take care not to let the heat spoil yours. Those taking to the hills this weekend were advised to be vigilant of overheating, dehydration and symptoms which could lead to heatstroke, while those enjoying the water were urged to act responsibly. Police Scotland and Loch Lomond & The Trossachs National Park said rangers spent last weekend attending narrow misses, collisions, sinkings and breakdowns. David Cameron, national park ranger, said: "Over the weekend, we reported 32 byelaw violations and witnessed a number of incidents including collisions between jet skiers and a collision between a boat and a jet ski. Police Scotland will be out with rangers on patrol boats this weekend. Inspector Gerry McMenemy said: "Please respect the rules, byelaws and speed limits on the loch.