The insurgent group kidnapped 110 schoolgirls last month.

El-Sissi has already ensured his victory in the balloting that runs from March 26-28, after the imprisonment of three contenders and the withdrawals of four other opponents.

"It is you rich people who have finished the water, and now you want us to share the consequences."

The bishop of Matamoros, across the border from Brownsville, Texas, has expressed alarm after two church explosions within four days.

The Diocese of Knoxville dedicated the country's newest cathedral on March 3 during a special Mass which celebrated the growth of the Catholic Church in this region of the United States.

The voices of the Parkland shooting survivors "should ring in our ears," the bishops said.