People release balloons during a ceremony to commemorate the first anniversary of the Sewol ferry sinking at a port in Jindo, South Korea.

People release balloons during a ceremony to commemorate the first anniversary of the Sewol ferry sinking at a port in Jindo, South Korea. Image by .(Park Chul-hong/Yonhap via AP)

South Korea’s president has promised to raise the submerged ferry that sunk a year ago killing 304 people.

Black-clad relatives and their supporters remembered the dead, most of whom were high school students, at a mourning ceremony on the anniversary of the sinking of the Sewol in one of the country’s worst maritime disasters.

Earlier in the day, relatives blocked the prime minister from attending a mourning event. They later cancelled another ceremony because of what they called government indifference to their plight.

There is frustration among South Koreans who see their government as having failed to make meaningful improvements to safety standards and hold high-level officials accountable for a disaster blamed in part on incompetence and corruption.

South Koreans watch a documentary film about the sunken ferry Sewol after relatives canceled a memorial service outside a group memorial altar in Ansan, South Korea.

South Koreans watch a documentary film about the sunken ferry Sewol after relatives canceled a memorial service outside a group memorial altar in Ansan, South Korea. Image by (AP Photo/Lee Jin-man)

Hours before a trip abroad, President Park Geun-hye visited a small port near the site of the sinking to offer condolences to bereaved relatives. Most, however, refused to meet her to protest the government’s response.

Park gave a speech anyway, announcing plans to salvage the ferry – a demand of the relatives. She said the operation would happen “as soon as possible.”

Flags at public buildings were lowered to half-staff and a minute of silence was observed in Ansan, the city that lost nearly an entire class of students on a doomed field trip to a southern resort island. A private ceremony was planned at Danwon High School in the evening.

Police officers spray liquid at protesters trying to march after a rally to commemorate the first anniversary of the Sewol ferry sinking in Seoul, South Korea.

Police officers spray liquid at protesters trying to march after a rally to commemorate the first anniversary of the Sewol ferry sinking in Seoul, South Korea. Image by (AP Photo/Lee Jin-man)

Relatives cancelled a memorial service in Ansan that thousands were planning to attend. They expressed anger over Park not visiting the site and not giving a firm commitment for a deeper investigation into what they say is government responsibility for the sinking and botched rescue.

The relatives also claimed that Ms Park should have delivered a more detailed plan for salvaging the ship in her speech at the port, according to Pil Kyu Hwang, a lawyer representing the families.

The estimated cost of raising the ferry is between 91 million US dollars and 137 million US dollars, and it could take as long as 1-and-a-half years.

Relatives in Ansan wept and touched pictures of their lost loved ones as they recalled helplessly watching on television as the ferry slowly sank into the sea.

Scores at the port near the sunken ship walked to a lighthouse where hundreds of yellow ribbons were tied to handrails in memory of the victims.

Mourners including family members and students attended an evening rally in downtown Seoul, where relatives have protested for months. The group tried to march to the president’s home but was blocked by police.

Earlier, politicians overwhelmingly approved a resolution urging the government to salvage the ferry.

(Press Association)