You heard “lockdown” in the news.

A lockdown is a rule that stops people from entering or leaving a place.

For example: The school went into lockdown during the safety drill.

Here, the school followed rules that kept people from entering or leaving.

You heard “disrupted” in the news.

It means that something interrupted normal activity.

For example: The roadwork disrupted traffic near my office.

The roadwork interrupted the normal movement of traffic.

You heard “arson” in the news.

Arson is the crime of deliberately setting fire to property.

For example: The police investigated the arson at the empty warehouse.

Here, arson means that someone may have deliberately set fire to the warehouse.