The House of Representatives on Wednesday summoned the Nigerian National Petroleum Corporation and 19 other oil and gas companies operating in Nigeria over the $17 billion worth of  crude oil. 
The crude is believed to have been stolen through undeclared exports between 2011 and 2014.
An ad hoc committee set up by the house to investigate the theft was inaugurated at the national assembly on Wednesday.
The committee insists over 57 million barrels of Nigeria’s crude were illegally exported and sold in the USA” alone within the period under review.
And the estimated revenue loss by the government is around N12.7 billion at an exchange rate of N196 naira to one US dollar.