Jurors in the Florida trial of a man accused of killing an unarmed teen in a dispute over loud music appear deadlocked on at least one charge, lawyers said. As of about 1 p.m. EST Saturday, jurors had given no sign they were any closer to resolving their differences in the trial of Michael Dunn, a software engineer accused of killing Jordan Davis in a Jacksonville gas station parking lot after he approached a vehicle Davis and three friends were sitting in playing loud rap music. Jurors asked Duval County Judge Russell L. Healey Saturday morning, shortly after deliberation began, whether they could return a unanimous verdict on some of the charges but not all of them, the Florida Times-Union reported. Healey said they could and jurors returned to their deliberation. Healey handed them the case Wednesday evening and they've deliberated a total of 26 hours since then. The question left lawyers for both sides with the impression the jury had agreed on a unanimous verdict in at least some of the four counts -- one of first-degree murder for Davis' killing and three counts of attempted murder for each of the three friends in the vehicle Dunn shot at, and shooting into a vehicle, the Los Angeles Times said. Dunn, 47, has claimed self-defense, saying Davis, 17, was verbally aggressive and threatened him after Dunn requested he turn down the music. Dunn said he thought he saw a shotgun barrel sticking out the window of the teens' car. Police said no weapons were found in the vehicle.