Relatives of victims of the sunken South Korean ferry 'Sewol' staged a sit-in early on Friday.
The large crowd had initially marched towards the Blue House in Seoul, calling for a meeting with President Park Geun-hye, but police blocked their path so they sat down on the streets near the presidential palace.
"We should rather die than leave here," said a family representative Kim Byung-kwon.
Victim's relatives are pushing for a direct meeting with President Park to discuss concerns about the rescue operation.
Relatives of the dead and missing passengers and many other South Koreans have been highly critical of the government's handling of the rescue effort, and the regulatory failures that may have allowed the disaster to happen.
Park has apologised over the sinking at least three times but her apologies came during meetings with top officials and religious leaders.
More than three weeks after the sinking, 273 bodies have been retrieved but 31 others are still listed as missing.
Searches have been hampered by strong currents, bad weather and floating debris inside the ship.