AMC cinema shares surge in 'frantic' trading

Shares in the US cinema chain AMC surged on Wednesday in what could mark a return to frenzied trading that rocked markets earlier this year.

Trading in AMC Entertainment was halted briefly several times as high volumes of shares were bought and sold.

AMC stock climbed as much as 100%, peaking at $69.09 part-way through the day.

The firm promised to give free popcorn to smaller investors.

Analysts have said that so-called "meme" stocks, such as AMC and GameStop, should be approached with caution.

It is the latest example of amateur investors trying to seize power from Wall Street giants.