No reports of Aust deaths in Bangkok
It's too early to know if any Australians have been killed or injured in the Bangkok bomb blast, the Department of Foreign Affairs and Trade says.
Officials are working with Thai authorities to determine if any Australian have been affected.
"At this stage we have no information that Australians are among the deceased or seriously injured," a DFAT spokesperson said in a statement on Tuesday.
Australia has condemned the attack, which has killed at least 19 people and injured more than 120 others. Some of the dead are foreigners.
"The Australian government deplores the attack in Bangkok. The thoughts of all Australians are with the injured and the families of those who have lost their lives," DFAT said.
Authorities say the bomb was clearly aimed at foreigners, and went off outside a popular religious shrine in a precinct popular with tourists and dotted with high-end hotels.
Australian rocker Jimmy Barnes and his family were among those to escape injury, but have told of seeing bodies lying in the street.
Barnes, his Thai-Australian wife Jane, daughter Elly-May, her husband Liam Conboy and their young son Dylan were heading out for dinner when the bomb went off.
"We have been able to cross back to our hotel. Bombs diffused. Bodies still covered on road, terrible, so sad," Jane Barnes tweeted in the aftermath of the attack.
Phnom Penh Post managing editor Alan Parkhouse was with the family and says they contemplated walking past the shrine to their dinner venue but instead took an overhead walkway, which might have saved their lives.
Mr Parkhouse has spoken of the group's close call.
"We opted for the overhead route - a decision that probably saved our lives," he's told Fairfax media.
"As we made our way across the overhead walkway from the shopping centre to the hotel, there was a very loud explosion and the glass lining the closed-in walkway shook and almost buckled from the shockwave of the blast."
He said the group fled to the safety of a hotel. "(We) stood there for a minute, shaken and trying to decide on where was the safest place to be.
The foyer of the hotel was chaotic with people running both in and out, but we were safe there."
He said they eventually left the hotel, stopping at one stage to talk to a television crew from a Chinese network.
"They said they'd seen a mangled body under a sheet at the blast site and there were reports of another bomb at the intersection that was being defused by a bomb disposal unit." He said they eventually reached the restaurant, carrying nappies for the rocker's grandchild.
"Jimmy joked about the headlines in tomorrow's papers: Rock star makes nappy run during bombing," Mr Parkhouse said.
Melbourne man Hussain Masri was on his way to at ATM when the bomb went off. He said he might have been caught up in the blast had he not changed his route to avoid traffic on the road.
"People were yelling and screaming. All you could see was fire burning. People screaming," he told Nine Network.
"After the blast it was so scary, especially seeing bodies and limbs and motorbikes on fire and the smell. The smell of burning is ... I don't know."
Mr Masri said he and other westerners ran to the site to try to help but the roads had descended into chaos, hampering the arrival of rescue teams.