Было Donetsk residents flee Ukraine fightingDONETSK, Ukraine (CNN) —Long lines of cars jammed the roads leading south out of Donetsk in eastern Ukraine Saturday as residents attempted to flee the city center after a night of heavy shelling on the city's northern outskirts.Hundreds of vehicles were caught in heavy traffic, and trains are no longer running in and out of the city, which is a stronghold for the pro-Russia rebels.There was heavy shelling and antiaircraft fire on the outskirts of the city to the north throughout the night. There has been sustained fighting in the area for weeks, but it appeared more intense overnight than in recent days.Russian news agency Interfax reported a dramatic increase Saturday in the number of Ukrainian refugees seeking refuge over the border in Russia.An additional 4,600 people have moved into temporary camps over the past 24 hours, Interfax cited Russian Emergency Situations Ministry spokesman Alexander Drobyshevsky as saying. This has pushed the total number of refugees staying in such camps above 31,000, he said.Russia has opened 20 new temporary settlements for Ukrainian refugees in the past day, Drobyshevsky told Interfax, bringing the total number provided to 433. More than 11,000 children are among those staying there, he said.CNN cannot independently confirm the report.According to the latest figures from the United Nations' refugee agency, UNHCR, a total of 141,972 Ukrainians had fled to Russia this year because of unrest in eastern Ukraine, based on information from the Russian Federal Migration Service as of July 22. More than 41,000 of those Ukrainians are reported to have applied for asylum.An additional 101,617 Ukrainians were reported as internally displaced within Ukraine as of July 22, the UNHCR said.However, the refugee agency noted that because of the lack of a centralized registration system, the real number of those who have fled their homes is unknown and is likely to be higher."Various organizations report that some displaced persons from the East are reluctant to apply to the authorities because they fear retribution, want to maintain a low profile, and moreover, see little benefit in identifying themselves as there is no special reception procedures established for them," the UNHCR said.Fear of reprisalsWhile most have fled conflict in the country's east, others have left Ukraine's southeastern Crimea region, which was annexed by Russia in March, and the areas around the capital, Kiev, and the cities of Odessa and Lviv in the west.UNHCR spokeswoman Melissa Fleming told reporters in Geneva a month ago that most of those arriving in Russia had not requested asylum."Most people are seeking other forms of legal stay, often we are told because of concerns about complications or reprisals in case of return to Ukraine," she said. Many are being accommodated in tented camps around the southern city of Rostov-on-Don, she said.Groups of pro-Russian rebels have been fighting Ukrainian government forces in eastern Ukraine's Donetsk and Luhansk regions since April.The sides continue to trade accusations over who was responsible for bringing down Malaysian Airlines Flight 17 on July 17, with the loss of all 298 passengers and crew aboard.But the international outrage over the downing of MH17 has not stopped the conflict.'We are a peace-loving people'Ukrainian army tanks were seen moving in to closer positions outside Donetsk by the morning, a rebel commander told CNN. The tanks were within a kilometer or two of improvised rebel lines along the northern city perimeter.One woman told CNN, "I want you to tell the world the terrorists must stop bombing us, we are a peace-loving people." As she said the word "terrorists," she pointed toward the Ukrainian army side.The Ukrainian authorities, in turn, routinely refer to the pro-Russia rebels as terrorists.Meanwhile, National Defense and Security Council spokesman Col. Andriy Lysenko told reporters Saturday that the Ukrainian army is now in the suburbs of the city of Horlivka, about 45 kilometers north of Donetsk.Freeing Horlivka from rebel control would open up a direct way to enter Donetsk, he said.Ukrainian forces were attacked 23 times in the past 24 hours, Lysenko said.Russia continues to increase its military presence along the Ukrainian border, he said, adding that intensive air intelligence efforts are focused on violation of Ukrainian airspace from Russia.According to the Twitter feed for the press office of the self-declared Donetsk People's Republic on Saturday, fighting has also broken out at five border checkpoints that appear to be on the Russian side of the Ukraine-Russia border.Russia's state-run RIA Novosti news agency also reported fighting at five border checkpoints, naming three places on the Russia side of the border, Novoshakhtinsk, Kuybishevo and Gukovo.