Public security authorities and transportation companies must boost security, said an article in Beijing Youth Daily (excerpts below).

On Monday, a man stabbed 15 passengers on a bus, killing three minors in Anyang, Henan province.

The alleged murderer has been arrested but public concern over transportation security is growing.

As a cheap, convenient and green method of transportation, the bus is a popular choice.

But ensuring security can be a big problem.

People hop on and off, it is easy to bring on bags.

Ensuring greater security could lead to inconvenience.

In Monday's incident, only the quick thinking of the driver prevented more deaths from occurring.

Transportation companies must begin to look at the issue of security and improve it.