By Daniel Hunter

Aggreko shares have fallen by nearly 15% in early trading after the temporary power firm issued a profit warning.

Aggreko had forecast full-year profits of £290 million, but now says it expects to report a profit between £250m and £270m as a result of ongoing security problems in Yemen and a slowdown in North America.

“While we will be seeking to mitigate the profit impact by reducing operating costs, there will be a net adverse impact on profits this year and in 2016,” Aggreko said in a statement.

“The ongoing security challenges in Yemen have impacted our ability to operate at full capacity and we remain concerned about the impact for the remainder of the year.”