Sudan planes bomb South Sudan oil field; 2 dead (AP) RUBKONA, South Sudan - Sudanese warplanes bombed a market and an oilfield in South Sudan, killing at least two people hours after Sudanese ground forces reportedly crossed into South Sudan with tanks and artillery, elevating the risk of all-out war between the two old enemies. The international community urged Sudan and South Sudan to talk out their disputes, which include arguments over where the border lies and over ownership of oil resources. The bombs fell from two MiG 29 jets onto Rubkona's market with a whistling sound, turning stalls where food and other household items are sold into fiery heaps of twisted metal. The burned body of the boy lay flat on his back near the center of the blast site, his hand clutching at the sky. A hospital official in Bentiu said nine people were wounded. Obama tackles mass atrocities; spotlights Syria, Kony South Sudan military spokesman Col. Philip Aguer said Antonov bombers accompanied by MiG 29 jets also bombed Abiemnom in Unity State and Unity oilfields. Aguer says Abiemnom is a two hour drive from Rubkona. Amid poor communications, the extend of damage at the oil field was not immediately known, nor whether there were casualties. Fighting between grounds troop which started Sunday was still going on in Panakuac, Laloba and Teshwin, Aguer said. In Rubkona, trucks packed with South Sudanese troops sped off in the direction where the bombs landed as the soldiers fired at the Sudanese jets. "The bombing amounts to a declaration of war," said Maj. Gen. Mac Paul, the Deputy Director of Military Intelligence for South Sudan. U.S. State Department spokeswoman Victoria Nuland said Monday the U.S. strongly condemns Sudan's military incursion into South Sudan, and called for the immediate halt of aerial and artillery bombardment in South Sudan. "We recognize the right of South Sudan to self-defense and urge South Sudan to exercise restraint in its reaction to Sudan's attack in Unity State," she said. Sudanese armed forces launched an attack Sunday more than six miles inside South Sudan's border, even though the south announced on Friday it was pulling its troops from the disputed oil town of Heglig to avoid an all-out war. South Sudan had invaded Heglig earlier this month, saying it belonged to the south. Sudan President Omar al-Bashir visited Heglig on Monday to inspect the damage, according to the official Sudanese news agency. Sudan claims its forces liberated the town from South Sudan. Al-Bashir has vowed to teach his southern neighbors a lesson. Paul said two MiG 29 jets belonging to Sudan dropped three bombs on Monday, two of which landed near a bridge that connects Bentiu, the capital of Unity State and Rubkona, another town. It was not the first time Sudan has targeted the bridge between Bentiu and Rubkona. Two Sukhoi fighters dropped bombs within 100 yards of the same bridge earlier this month. Sudan and South Sudan, the world's newest country, have been drawing closer to war in recent months over the sharing of oil revenues and a disputed border. On Saturday night, a Muslim mob burned a Catholic church in Sudan frequented mostly by South Sudanese. The church in Khartoum's Al-Jiraif district was built on a disputed plot of land, but the attack appeared to be part of the fallout from ongoing hostilities between Sudan and South Sudan. Paul said late Sunday that South Sudan is building up its forces because they think Sudan is also doing the same. The international community, led by the U.S., has called for the two countries to stop all military actions against each other and restart negotiations to solve their disputes. President Barack Obama on Friday asked the presidents of Sudan and South Sudan to resume negotiations and said that conflict is not inevitable. African Union-mediated talks between the two countries recently broke down in Ethiopia. The African Union on Sunday called on Sudan and South Sudan to end "senseless fighting." The European Union in a statement on Monday also urged Sudan and South Sudan to end their armed confrontation and negotiate. The EU welcomed South Sudan's decision to withdraw its troops from neighboring Sudan's oil-rich town of Heglig and warned the government not to mount any more attacks. It also called on Sudan to refrain from attacking the withdrawing forces and cease aerial bombardment of South Sudan. South Sudan broke away from Sudan in July last year after an independence vote, the culmination of a 2005 peace treaty that ended decades of war that killed more than 2 million people.