Some days and one and off, I had been having squeaking sound from the bicycle- couldn't pin down the location other than rear of the bike. Suddenly when crossing the road while at low gear, a spoke shattered- I didn't know what happened. I pushed the bicycle slowly to a bicycle shop but they couldn't fix it and directed me to a distant bicycle shop.  The wheel was out of alignment. The spoke had only the rim attachment.  I riding slowly with a light load to a bicycle shop - trying a slightly further one where I had bought it and was more convenient and there was a boom and the tube had ruptured. I was under pressure because my son was home from school and I was meant to look after him soon. What happened and how to prevent it? The bicycle shop replaced the entire tire and tube and spokes within a few hours. There was never an option to keep the original tire. 
By the way This is the bicycle. I live in Japan and can't converse with bicycle repairer. 
https://bicycles.stackexchange.com/questions/62283/my-new-bicycle-skids-laterally-especially-in-the-wet-what-can-i-do-about-it

My father-in-law called them and he could only get the information that they replaced the tire and the tube and three spokes.