TRIPOLI/ROME: A day after searching a stretch of the Mediterranean Sea, an Italian humanitarian group said on Friday that its rescue vessel found no trace of a boat said to be in distress and carrying 500 migrants, including a newborn. The vessel “Life Support found no wreckage of any shipwreck, and the 500 persons didn’t disembark in Italy,” the nongovernmental organization Emergency said in a written statement from Milan. ”It’s hard to believe that no coastal authority knows where those 500 persons are.” Emergency raised the possibility that the migrants were brought back to Libya, the launching point for many of the smugglers’ unseaworthy boats that aim to bring migrants to Italy’s shores. The group’s statement said that Libyan authorities so far were denying it brought the passengers back to Libya, where many migrants spend months in inhumane conditions in detention camps, often enduring beatings or rape, until they or families back in their homelands can pay smugglers for the sea journey toward Italy. On Tuesday, another NGO, Alarm Phone, which receives calls from migrant boats in distress, said a boat filled with 500 migrants needed help. SPEEDREAD Believed to be aboard the boat are 45 women, some of them pregnant, and 56 children, including a baby apparently born during the journey. “Life Support” sailed for 32 hours to reach the area where the distressed ship was believed to be and searched for 24 hours on Thursday in international waters that are part of Malta’s search-and-rescue area. But the group said on Thursday that worsening weather was forcing it to end the search. The Libyan coast guard didn’t immediately reply to a request for comment about Emergency’s hypothesis that the migrants were taken back to Libya. On Thursday, the Italian coast guard said one of its vessels, in two separate operations, rescued nearly 1,100 migrants from two fishing boats in distress in its search-and-rescue area. The Italian coast guard denied any role involving a third boat in difficulty, with 27 migrants aboard. It said merchant ships were involved in aiding that boat, and “although initially contacted by the Italian rescue center, they (the cargo ships) then received instructions directly from the Libyan authorities, as part of an event occurring inside the area of responsibility” of Libya. The Libyans “legitimately took on the coordination” of the rescue, the Italian coast guard said in a statement on Thursday that denied involvement in any “pushing back” of the migrants to Libya.