By Daniel Hunter

Toyota's managing director has resigned after being arrested last month for allegedly bringing drugs into Japan.

The world's biggest car manufacturer said it had received Ms Hamp's resignation letter, which was accepted.

The American was arrested last month after allegedly illegally importing the painkiller oxycodone in the mail.

"we intend to learn from this incident to help ensure a secure working environment for everyone at Toyota around the world as we continue to take the steps necessary to become a truly global company," Toyota said.

"We remain firmly committed to putting the right people in the right places, regardless of nationality, gender, age and other factors."

Ms Hamp is accused of importing 57 oxcyodone by sending packages labelled "necklaces" addressed to herself.

Oxcyodone is legal is both the US and Japan, but only those with a prescription are allowed to bring it into Japan.