Eight people, including a baby boy, were killed after assailants burst into a home in north-central Mexico and opened fire, authorities said on Wednesday.

The assailants first entered a home on the outskirts of the city of Silao late Tuesday and targeted four men, killing them and a woman on the spot. Cops suspect the house may have been used by drug addicts. Another man wounded in the attack on the home succumbed to injuries on Wednesday. 

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At a nearby house, police found a 16-year-old girl and a 16-month-old boy dead of gunshot wounds. It was, however, unclear if they also were targeted or had been hit by stray bullets from the first shooting.

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Guanajuato state prosecutors said three other people were injured in the incident and were in serious condition at local hospitals as of Wednesday. The motive behind the shooting was not known. 

The killings shocked people in Guanajuato, the state with the highest number of homicides in Mexico.

“What happened today in Silao hurts us deeply and as the government of Guanajuato, we will continue to work together to give no quarter to those cowards who take other peoples’ lives,” Libia García, the state interior secretary, wrote in her Twitter account. “Justice will be done for the victims.”

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Earlier this month, four men were killed by armed assailants in the town of Cueramaro, near the border with Jalisco state. The assailants entered a home where a holiday-season party was being held and opened fire. Two other men were wounded in the shooting. 

With inputs from The Associated Press