Yemeni government operations have driven it out of some of the southern tribal areas it overran in 2011.
And China keeps giving reminders of its unresolved wrangle with India over what is now the Indian state of Arunachal Pradesh, which it briefly overran in 1962.
Bolstered by ransoms paid for kidnapped Europeans, they have weapons captured from Malian bases they overran in the north or smuggled from Libya after Muammar Qaddafi fell.
Bolstered by ransoms paid for kidnapped Europeans, sometimes worth millions of dollars each, they have plenty of weapons captured from Malian bases they overran in the north or smuggled from Libya since Muammar Qaddafi's fall.
The transport secretary said the problems at King's Cross had arisen when work overran in a scheme to modernise points and overhead wiring, replacing 1km of track, and involved 14 engineering trains.
The terror group's statement implied it drew no distinction between civilians and security forces with whom it is battling to retain control of more than a third of the country that it overran in mid-2014, in a rampage that threatened Iraq's ongoing viability.
