More than a decade after George W Bush launched it, the "war on terror" was supposed to be winding down. US military occupation of Iraq has ended and Nato is looking for a way out of Afghanistan, even as the carnage continues. But another war – the undeclared drone war that has already killed thousands – is now being relentlessly escalated.

From Pakistan to Somalia, CIA-controlled pilotless aircraft rain down Hellfire missiles on an ever-expanding hit list of terrorist suspects – they have already killed hundreds, perhaps thousands, of civilians in the process.

At least 15 drone strikes have been launched in Yemen this month, as many as in the whole of the past decade, killing dozens; while in Pakistan, a string of US attacks has been launched against supposed "militant" targets in the past week, incinerating up to 35 people and hitting a mosque and a bakery.

The US's decision to step up the drone war again in Pakistan, opposed by both government and parliament in Islamabad as illegal and a violation of sovereignty, reflects its fury at the jailing of a CIA agent involved in the Bin Laden hunt and Pakistan's refusal to reopen supply routes for Nato forces in Afghanistan. Those routes were closed in protest at the US killing of 24 Pakistani soldiers last November, for which Washington still refuses to apologise.