The accident happened at around 10.45 a.m. on the level crossing at Rillamba Junction in Boossa.
According to Ada Derana correspondent, the mother, father, son and daughter-in-law had been travelling in the three-wheeler at the time of the accident.
All of them were rushed to the Karapitiya Teaching Hospital following the fatal collision, however, three of them have succumbed to injuries.
They were identified as residents of the same area.
UPDATE: The death toll from the said accident has increased to four as the other person who was hospitalized also succumbed to critical injuries, the police confirmed. – ada derana