The Government is facing a fresh strike by civil servants after a union announced it is balloting 250,000 of its members in a row over pay, pensions and working conditions.
The Public and Commercial Services union (PCS) warned of a series of walkouts across England, Wales and Scotland, adding that it would seek support from other unions about co-ordinated action.
Voting will start on February 8 and close on March 4, raising the threat of pre-Easter stoppages.
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The suspect, 35-year-old Willie Corey Godbolt, has been arrested and was being treated for a gunshot wound in hospital.
Mohanna Abdhou, known as Montana, was out with friends when two attackers cycled up to them and opened fire in Brent, north-west London.
The US president tweeted that Mrs May gave him "full details" of the incident during talks while he attended summits in Europe.