Craft beer firm BrewDog has launched a new equity scheme in America to fund its latest venture.

The Aberdeenshire-based brewery is hoping to raise $50m(£38m) from investors in the US to support its new 42-acre brewery site in Columbus, Ohio, and the expansion of its chain of branded bars.

The Equity for Punks scheme, first launched by founders Martin Dickie and James Watt in 2009, has already raised more than £26m from four previous rounds of crowdfunding.

The equity drive, which gives shareholders discounts in its bars and entry to the company's annual meeting, was only made possible in the US last summer following a change in legislation.

The company, which already has 42,000 people signed up to Equity for Punks, has given itself six months to raise the cash.