Three people were also killed in the attack, according to local officials.
Nigeria is struggling to end a 13-year jihadist insurgency in its northeast, while criminal gangs in the northwest raid villages and kidnap or kill residents despite army operations against them.
“From the tragedy in Owo two weeks ago that shook our nation to its core, to the killings and kidnappings just this weekend in Kaduna State, it is clear that there is a design by wicked people to put the country under religious stress,” Buhari was quoted as saying late Wednesday.
Although no group claimed responsibility for the attacks, Buhari said the assaults were politically motivated by “enemies” seeking to destroy the country’s unity.
“We will not let them. The nation will not be distracted or divided by these obviously planned and politically motivated criminal outrages,” he said.
Buhari, a northern Muslim steps down next year after two terms in office, and security will be a major challenge for whoever wins the February 2023 presidential election.