Why the authorities did not act then and possibly prevent the second attack is unclear.

One evening only the authority of the Count prevented a fight breaking out in the hall.

It is not clear either how the authorities will prevent the illicit export of art.

The authorities sealed the campus and prevented most students from leaving.

At the bus stop, the authorities prevent her from leaving.

A central authority to implement these policies and prevent the variation in practice which occurred under the old poor law.

Most English people cannot even go to this land they possess; the authorities would prevent it.

Would these standards and legislative authority have prevented this disaster?

The authorities should prevent criminal money from penetrating the financial system.

This will allow authorities to test the animal and prevent further incidents.