NAIROBI, Kenya — A suspected al-Shabab raid in the border town of Mandera has left at least 12 people dead and has reignited a sequence of bloody attacks on Christians in northern Kenya.

The dead included actors and performing artists who had traveled from Nairobi to stage theater performances for high school seniors in the largely Muslim region on the border with Somalia.

The attack, which recalls previous massacres, comes barely two weeks after six non-Muslim quarry workers were murdered.

“We are alarmed that the attacks on non-Muslim workers, the majority of whom are Christians, continue to rise,” said the Rev. Alfred Muriithi, a Roman Catholic priest based in neighboring Wajir County. “The situation is getting difficult in Mandera. The attacks are too frequent and deadly.”

Al-Shabab, the al-Qaida affiliate in Somalia, was responsible for the 2015 Garissa University attack in which gunmen armed with AK-47s stormed the Kenyan college, killing 148 people, most of them Christian students.

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