The US President paid his respects after one police officer was killed and two others seriously injured in the deadly shooting, despite initial reports saying two police officers had been killed.
'It just never ends, ' he said of the terror threat from the White House's East Room.
"Again, it is happening again, it seems". Hollande says that French authorities are convinced that this is a terrorist attack.
Trump called the shooting "a bad thing and it's a very very awful thing that's going on in the world today".
"We have to be strong, we have to be vigilant, and I've been saying it for a long time", Mr. Trump added.
Brighton first club to secure promotion to the Premier League this season
We did that really well in the summer, bringing in good stable individuals to help the team, and they've [all] grown since then. Our away form has improved from a year ago and probably that's the key to the success we've had this season.
The gunman killed at the scene was known to security sources, a police source said.
Officials say the suspect in the attack on Paris police officers previously was flagged as an extremist.
The attacker targeted police guarding the area near the Franklin Roosevelt subway station Thursday night at the center of the avenue popular with tourists, police said.
Thursday's attack comes days before the nation's presidential election on Sunday, which will take place under a state of emergency, which has been in place since November 2015.
The nature of the incident and details about the attacker were not immediately clear.