DEVELOPING: A police officer was killed and two were seriously injured when a gunman opened fire late Thursday on the famed Champs-Élysées shopping district in Paris before he was shot dead, officials said.
Paris police spokeswoman Johanna Primevert told The Associated Press that the attacker, who is believed to have acted alone, targeted police guarding the area near the Franklin Roosevelt subway station at the center of the avenue popular with tourists.
The attacker was known by secret service in France, officials confirmed to Fox News. Police sources told France 24 searches are currently ongoing at the home of the gunman killed in the attack.
An eyewitness told Reuters the man got out of a car and began shooting "with a kalashnikov."
Authorities warned people in the heart of the French capital to avoid the area after the shooting, France 24 reported.
Many police vehicles can be seen on the avenue that passes many of the city's most iconic landmarks.
President Trump said the shooting "looks like another terrorist attack" during a news conference with Italian Prime Minister Paolo Gentiloni, and sent his condolences to France.
French President Francois Hollande scheduled an emergency meeting late Thursday following the shooting attack.
The incident on Thursday was similar to two recent attacks on soldiers providing security at prominent locations around Paris, one at the Louvre museum in February and one at Orly airport last month.
The attack came three days before the first round of balloting in France's tense presidential election.
Security is high preceding the vote after police said they arrested two men Tuesday in what they described as a thwarted terror attack.
France has been in a state of emergency following a series of terrorist attacks, including the the November 2015 attacks, which targeted the Bataclan concert hall and Stade de France sports arena in Paris and the deadly truck attack in Nice on Bastille Day in July 2016.
The state of emergency has been extended by several parliamentary votes and remains in effect.
The Associated Press contributed to this report.