Former soldier and para-athlete Chaturong Suksuk, 29, killed his wife Kanchana Pachunthuek, 44, hours after they were married.

He abruptly left the wedding party late on Saturday and returned with a gun, according to reports by local media.

He shot dead the bride's mother and younger sister, along with a wedding guest. Another guest was seriously injured, according to the Bangkok Post.

Guests noticed the groom did not look happy at the party, local media reported.

Chaturong "was quite intoxicated at the time", police told the BBC, saying his motive remained unclear.

He had bought the gun and ammunition legally last year, they added.

It was also reported Chaturong felt insecure about the 15-year age gap between him and his wife, but police told the BBC this was still speculation.

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Officers told the Bangkok Post eleven bullets were found at the scene of the shooting, which took place in Wang Nam Khieo district.

Chaturong was a former soldier who became disabled after one of his legs was run over by a train and cut off, according to police.

He won a silver medal in swimming at the Asean Para Games in Indonesia last year.

He was also on the list of athletes competing in the World Abilitysport Games in Thailand next month, local media reported.