The 39-year-old was taken to hospital after the attack in London's Hyde Park, police say.
The famous Paseo del Prado and Retiro Park are symbols of the Spanish capital's history.
President Joe Biden's top medical adviser says cases are rising in areas with low vaccination rates.
Torrential rain saw severe flooding in homes, roads and tube stations in parts of London on Sunday.
Watch the best moments from Sunday's Hundred matches as London Spirit host Oval Invincibles and Manchester Originals take on Birmingham Phoenix.
Matt Parkinson bamboozles Birmingham Phoenix with a sensational spell of leg-spin bowling to give Manchester Originals their first win of The Hundred.
The USA's men's basketball team see their 25-game winning streak at the Olympics ended as they are stunned 83-76 by France in their Tokyo opener.
The Royal College of Nursing says the comments at a protest rally were "reprehensible".
Birmingham Phoenix's Issy Wong takes a huge swing, loses her bat and is caught for 10 in the women's Hundred match against Manchester Originals at Old Trafford.
Supply firms are having to fight to keep food on supermarket shelves, an industry body warns.
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