Amazon has reported a loss of $126m in the second quarter and warned that sales could slow in the current quarter.

2014亚马逊英语新闻：2014第二季度亚马逊亏损1.26亿

Amazon forecast third quarter sales of between $19.7bn and $21.5bn, which could mean sales growth of as little as 15% - well down on previous quarters.

Amazon has traditionally survived on thin profit margins, but investors have been reassured by strong sales growth.

But today's warning over sales has spooked investors.

In after hours trading in the US shares slumped by 6%.

Digital content

Amazon has been investing heavily to build up its business, including the launch last month of its first smartphone - the Fire Phone.

It has been developing digital content including computer games and TV shows.

In its conference call the company said that producing its own TV shows would cost $100m in the third quarter.

Amazon has also been spending money on improving its delivery systems which includes expanding Sunday delivery to 18 cities in the United States.

2014亚马逊英语新闻：In its conference call the company said that producing its own TV shows would cost $100m in the third quarter.