Credit: CBS News --- Donald Trump appeared to be the target of an assassination attempt as he spoke during a rally in Pennsylvania on Saturday, two law enforcement officials said. The former president, his ear covered in blood from what he said was a gunshot, was quickly pulled away by Secret Service agents and his campaign said he was “fine.” A local prosecutor said the suspected gunman and at least one attendee are dead. The Secret Service said two spectators were critically injured. Posting on his Truth Social media site about two and a half hours after the shooting, Trump said a bullet “pierced the upper part of my right ear.” “I knew immediately that something was wrong in that I heard a whizzing sound, shots, and immediately felt the bullet ripping through the skin,” he said in the post. “Much bleeding took place, so I realized then what was happening.” The attack, by a shooter who law enforcement officials say was then killed by the Secret Service, was the most serious attempt to assassinate a president or presidential candidate since Ronald Reagan was shot in 1981. It comes amid a deeply polarized political atmosphere, just four months from the presidential elections and days before Trump is to be officially named the Republican nominee at his party’s convention. Trump's aides said late Saturday that the convention would proceed and Trump “looks forward to joining you all in Milwaukee.” “President Trump thanks law enforcement and first responders for their quick action during this heinous act,” spokesman Steven Cheung said in a statement. “He is fine and is being checked out at a local medical facility. More details will follow.” The Secret Service said the suspected shooter fired from “an elevated position outside of the rally venue.” Trump is “safe and being evaluated,” the agency said. “There's no place in America for this type of violence,” President Joe Biden, who is running against Trump as the presumptive Democratic nominee, said in remarks. “It’s sick. It’s sick.” Two officials spoke to The Associated Press on the condition of anonymity to discuss the ongoing investigation. They said the shooter was not an attendee at the rally and was killed by U.S. Secret Service agents. The officials said the shooter was engaged by members of the U.S. Secret Service counterassault team. The heavily armed tactical team travels everywhere with the president and major party nominees and is meant to confront any active threats while other agents focus on safeguarding and evacuating the person at the center of protection. Law enforcement recovered an AR-style rifle at the scene, according to a third person familiar with the matter who spoke on condition of anonymity to discuss the ongoing investigation. Homeland Security Secretary Alejandro Mayorkas, whose department oversees the Secret Service, said officials were engaged with the Biden and Trump campaigns and “taking every possible measure to ensure their safety and security.”