The son of Liberia's former President, Ellen Johnson Sirleaf, has been charged with economic sabotage following investigations into the unauthorised printing and importation into Liberia of tens of millions of dollars.

Charles Sirleaf was deputy governor of the Central Bank at the time.

The former governor of the bank, Milton Weeks, has been charged with the same crimes.

They have not commented on the charges.

The current President, George Weah, has also been criticised after two investigations found there was a lack of accountability for $25m (18m) imported into Liberia last year on his orders.

It had been widely reported that shipping containers full of banknotes had vanished from Monrovia's port and airport. However, a report, released last week by auditing firm Kroll associates, did not find any proof that this had happened.

Instead, it found that Liberia's Central Bank had acted unilaterally and unlawfully by printing and importing into the country three times the amount of banknotes it had been authorised to do.