The B-52 bomber had been conducting a flyover at a local fair.
SMRT said that the disruption on 19 July shares a "similar failure mode" with the one on 3 July.
Netizens praised the officers for their compassionate service.
The suspect demanded cash from those inside but left empty-handed after firing a shot outside the clinic.
It was later found that the cash was meant for the passenger's family back home.
Valuable parent-child bonding time.
She spent 12 hours in emergency treatment after being rushed to the hospital with limb paralysis and breathing difficulties.
The 60-year-old reportedly grabbed her hand and pulled her into the train with him, making her sit next to him.
Three other people from neighbouring units were assessed for smoke inhalation and sent to the hospital.
The shooter also rigged his own apartment to explode using homemade explosives.