International Desk: One policeman has been shot dead and two others wounded in central Paris, French police say, with their suspected attacker killed by security forces.
A lone gunman opened fire before being killed as he fled the scene, police say. The Champs-Elysees was sealed off.
President Francois Hollande said that he was convinced the attack was "terrorist-related".
So-called Islamic State (IS) said that one of its "fighters" had carried out the attack.
Islamist militancy is a major issue in the polls after recent mass attacks claimed by IS, with 238 people killed in jihadist attacks in France since 2015, according to data from a news agency.
Several candidates in Sunday's presidential election have ended their campaigns early as a mark of respect, with the centre-right's François Fillon calling on others to halt theirs too.
"On the face of it, the officers were deliberately targeted," Interior Ministry spokesman Pierre-Henry Brandet said.
Mr Hollande said after crisis talks with his prime minister and interior minister that the security forces had the full support of the nation and a national tribute would be paid to the fallen policeman.
He said he would hold a meeting of his security cabinet on Friday morning.
risingbd/April 21, 2017/Mukul