The blast occurred a day after two gunmen indiscriminately opened fire at three houses in Dhangri village, killing four people, police said.
Two suspects have been arrested after the incident in the country's southeast.
Plan to equip American police in the city with armed robots is sent back to the drawing board after city council members say they were having second thoughts.
Police fired tear gas and stun grenades as protesters burned roadblocks and threw Molotov cocktails in the centre of the port city of Thessaloniki.
The suspect, identified as Christopher Darnell Jones Jr., was taken into custody on charges of three counts of murder and three counts of using a firearm in the commission of a felony.
The trailer was carrying around 50 people, mostly women and children, when the incident happened in Kanpur in the northern state of Uttar Pradesh.
Japan's Prime Minister Fumio Kishida urged the Japanese police "to fix what needs to be fixed" after photos and videos of the shooting showed the gunman was able to come very close to Shinzo Abe.
Public anger mounts in Nigeria as the Ondo state police is yet to trace church attackers that are said to be at least five in number.
Police fired tear gas and used water cannon to disperse hundreds of protesters who came out on the streets in capital N'Djamena, accusing the former colonial power of supporting the country's military junta.
The year 2021 saw a 59 percent jump in the killings of cops, and now stands at the highest number since 1995.
Two minors were killed and at least eight others wounded in the shooting in Pittsburgh while a similar incident in South Carolina left at least nine people injured.
Authorities are investigating whether the attack was related to smuggling or tensions between Serbia and Kosovo.
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