| Israel keeps up ground attack despite truce calls (Reuters) [8 mins][Dimra] Reuters - Israel pressed on with its ground offensive in the Gaza Strip for a fourth day on Tuesday despite new international calls for a ceasefire in a conflict in which more than 540 Palestinians have been killed.Related stories: Israel deaf to truce calls as Gaza battles rage on Israeli attack splits Gaza; truce calls are rebuffed ~10 grouped stories | Warnings issued amid Arctic chill [25 mins] The Met Office issues severe weather warnings as temperatures in the UK plummet as low as -10C (14F) overnight.Related stories: Wind chill warnings issued in Saskatchewan, Manitoba ~2 grouped stories |