They also used to hurl stone to GP koirala during 50-51s. Once in 2049 i also was there in my district headquarter to hurl stone to GP Koirala, then PM but i was lucky to escape from police battle. It is most common in Nepal.
Now all bombs are in cantonment so they used stone. In US there is very rare to find stones except road gravel at road side, they use gun. The only difference!