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Shocking CCTV footage captures the moment patients ran for their lives when a husband shot his wife and her father in a hospital waiting room.

Thanyamas Thanamsri, 26, had been visiting doctors last Friday afternoon (15/06) with her husband Chaiyaporn, 31, and father, Samphan Thanamsri, 60, for postpartum problems.

Just two weeks ago she had come through surgery for kidney, heart and lung failure - posting a picture of herself and the six-week-old tot while writing ''death is closer than we expect so take care of the people you love''.

But she was having a check up today when the two men started arguing after the the wife's father criticised her husband for not having a job and said that she should leave him.

Furious Chaiyaporn pulled a gun from his bag and blasted his nagging father-in-law twice in the head before shooting his wife in the chest, arms and back. He then shot himself.

The baby boy survived the horror - with three of his family dying before his eyes.

Two patients were injured from stray bullets while dozens more ran screaming from the building as the bloodbath unfolded at the Nakhon Pathom Hospital in northern Thailand at 1.30pm.

Police are now investigating the horror double murder suicide.

Lieutenant Colonel Wuttisit Kongsarawat said: ''I arrived at the scene with other officers. It happened on the second floor of the hospital.

''There was blood on the floor and a .38 pistol. Two people were dead and another was seriously injured and sent for surgery.