A police officer on his way home has arrested a man wanted for questioning over two alleged separate incidents involving school girls in Sydney’s west.

In one incident, an 11-year-old girl was walking from school in Auburn when a man pushing a bike put her in a headlock.

She was able to struggle free and run home.

In a second incident, a 17-year-old girl was grabbed around the waist in Lidcombe.

The officer has driven past a man matching the description, and police say he is being questioned.

Image: Getty