Somber horns sounded Friday at the site of Bangkok's deadly bomb blast as officials joined a multi-religious ceremony for victims of this week's attack, the latest effort to show that the bustling capital was respectfully, if cautiously, moving on.

Police were still searching for the prime suspect seen in a security video and Thursday cleared two other men initially believed to be suspects.

Among the 20 people killed, Thai authorities have identified six victims as Thai and four as Malaysians, along with four mainland Chinese, two people from Hong Kong including a British citizen, one Indonesian and one Singaporean.

Two other people seen on the video near the man with the backpack were initially considered suspects but cleared Thursday after one of them turned himself in and said he was a tour guide and the other was a Chinese tourist, said national police spokesman Lt. Gen. Prawut Thavornsiri.

The two men were seen in the video standing in front of the prime suspect as he removed a backpack and placed it on a bench at the crowded shrine shortly before the blast.

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