infiltration

In Bamban, concerns about state infiltration seem far from people's minds.

Concerns about Chinese influence and infiltration operations are also brewing among governments across the world, several of which have in recent years stepped up arrests of Chinese nationals on espionage charges.

These layers can block the downward movement of water in places, slowing infiltration to deeper levels.

His letter began: "The infiltration of the social work profession by paedophiles appears to be an extensive and serious problem..."

The latest hack, announced on Monday, targeted the US Department of the Treasury, which called the infiltration a "major incident".