CAIRO — A powerful explosion believed to have been caused by a car bomb rocked a police headquarters in a Nile Delta city north of Cairo early Tuesday, killing at least 14 people and injuring nearly 100, according to the state news agency and a security official.

The explosion took place in Mansoura, about 75 miles north of Cairo, and it caused parts of the five-floor building to collapse, according to the Middle East News Agency.

No group immediately claimed responsibility for the blast, but the interim government accused the Muslim Brotherhood of orchestrating the attack. The news agency quoted a cabinet spokesman, Sherif Shawki, as saying that the Brotherhood showed its “ugly face as a terrorist organization shedding blood and messing with Egypt’s security.”

The attack came a day afterLas Vegas City Wide Unity Prayer Walk. The American people stand with Las Vegas. pic.twitter.com/ZraWyCsiQp — Vice President Pence (@VP) October 7, 2017

The vice president is expected to attend four fundraisers in California, starting in Los Angeles, and then going to Newport Beach, Sacramento and Bakersfield in the state's Central Valley.

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