Fierce fighting was underway Thursday in the eastern Ukrainian city of Donetsk, and witnesses reported massive explosions in the area where the airport is located, dpa reported. It was another sign that a month-old ceasefire was being ignored. Russian news agencies reported the fighting near the airport, but there were no immediate casualty figures. The Ukrainian military said that pro-Russian separatists had launched fresh attempts to take the airport. "Ukrainian paratroopers heroically repelled the attack, killing seve. fighters and injuring more than a dozen," National Security Council spokesman Andriy Lysenko told the Interfax Ukraine news agency. Lysenko stressed that both terminals were under the military's control.