Julio Acevedo, the man wanted by police in New York in connection with a hit-and-run accident that killed an expectant couple, told New York's Daily News he was fleeing a gunman who was trying to shoot at him.
The couple's baby was delivered prematurely after the crash on Sunday, but later died.
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There is no evidence the Westminster attacker Khalid Masood was associated with so-called Islamic State or al Qaeda, the Met Police said.
Janet Ajao said in a statement: "I do not condone his actions nor support the beliefs he held that led to him committing this atrocity."
After the PM triggers Article 50, Britain will need the other EU nations to agree to deals. Gibraltar could be key to Spain's demands.