By Kristina Wong - 07/28/14 04:54 PM EDT
National Security Adviser Susan Rice was interrupted by a protester on Monday as she gave a speech on the conflict in Israel at the National Press Club.
"Stop the violence, stop the killing!" he yelled to news cameras at the event, holding a sign that said "End the siege of Gaza."
The man was forcibly removed from the room by staffers, who knocked over some chairs in a scuffle as they removed him from the auditorium.
"These are difficult days," Rice continued calmly.
A reporter at the event captured a picture of the incident:
Protester interrupts Susan Rice at NPC speech, urges end to killing of innocent civilians in Gaza pic.twitter.com/UurVChhlHY— MichaelMathes (@MichaelMathes) July 28, 2014
The event came in the third week of a military conflict between Israel and Hamas in Gaza, which U.S. and international officials have tried to end with a ceasefire.