The couple "repeatedly attempted to sit in upgraded seating would not follow crew instructions to return to their assigned seats," United said.

The elections take place with France on heightened security alert following a spate of attacks by Islamist militants since January 2015.

The decision to activate the Terminal High Altitude Area Defence (THAAD) system came during talks between Hwang Kyo Ahn and Mike Pence.

There was no immediate claim of responsibility for the attack, which pro-Damascus media said was carried out by a suicide car bomber.

The Karabakh troops remained committed to the ceasefire to continue controlling the situation along the entire line of contact.

The U.S. early this month bombed a Syrian air base in reaction to what Washington said was a nerve gas attack by the Assad government.

South Korean prosecutors on April 17 charged ousted president Park Geun-hye and Lotte Group chairman Shin Dong-bin with bribery.

The attack on Saturday did not result in any deaths but did cause "limited injuries" among security personnel, the military said.

Erdogan said 25 million people had supported the proposal, which will replace Turkey's parliamentary system with an all-powerful presidency.