Four Malaysians have been killed in the Bangkok blast with two injured, said Malaysian Ambassador to Thailand, Datuk Nazirah Hussain.

All six are from the same family, she said in a text message to Astro AWANI.

She said she is currently on her way to Police General Hospital to meet the families of those involved in the blast.

Earlier Wisma Putra released the names of two Malaysians, mother Lim Saw Gek, 49 and her son Neoh Jai Jun, 20 who were confirmed killed in the blast.

The bodies of the victims are currently at the Police General Hospital for post mortem.

Wisma Putra then confirmed the death of another two Malaysians - Lee Tze Siang, 33 and his daughter Lee Jing Xuan 4.

Meanwhile, Wisma Putra in a statement said one of the Malaysian injured, Tan Rui Hun is currently admitted to Hua Chiew Hospital for treatment while another injured Malaysian, Tan Kim Siok has been discharged.

The statement said that an emergency operation room in Bangkok is now open and can be reached as per details below:

Weekdays: 8am until 8 pm

Contact numbers: +662-629 6800 and +6687 028 4659

+6687 028 4659 (after 8pm)

Weekends: 9am until 5pm

Contact numbers: +662-629 6800 and +6687 028 4659

+6687 028 4659 (after 5pm)

At least 21 people were killed, including foreigners and dozens injured when a bomb exploded Monday outside a religious shrine popular with tourists in the Thai capital, scattering body parts and debris.

According to Thai police, the blast occurred at around 7pm local time (8pm Malaysian time).

More than a 100 were injured as the blast left body parts strewn across crushed pavement, alongside shattered windows and incinerated motorcycles.

Thai Prime Minister Prayuth Chan-ocha said on Tuesday that authorities were looking for a "suspect" seen on closed-circuit television (CCTV) footages near the site of the bomb blast that killed 22 people, including eight foreigners.

"I have ordered the cameras be checked because there is one suspect, but it is not clear who he is," Prayuth told reporters at Bangkok's Government House.