The story was reported in the Sunday Times before feeding out into the wider internet. It is already being twisted in all sorts of ways.
It was actually a memorial service for the people murdered by Phalangist militias at Sabra and Shatilla in 1982.
What Corbyn actually wrote:
The PLO had relocated after the massacres at Sabra and Shatilla in 1982 when Israeli troops oversaw massacres by Phalangist militias at the huge refugee camps in Lebanon, home to Palestinians driven from their homes in 1948.It is not clear who he means when he refers to murders in Paris in 1991 - but claims it was connected to the Munich murders look very weak, as Atef Bseiso was killed in 1992, and also Corbyn refers to 'others' - more than one person.
After wreaths were laid at the graves of those who died on that day and on the graves of others killed by Mossad agents in Paris in 1991, we moved to the poignant statue in the main avenue of the coastal town of Ben Arous, which was festooned with Palestinian and Tunisian flags.
In a sane world, someone might ask Corbyn what he meant before blasting the stroy across the internet. But that was beyond the capacity of the Sunday Times (the original source of the smear) because it isn't interested in proper journalism, just propaganda.
Tories using the mass murders of Sabra and Shattila to score political points. That's pretty despicable.
EDIT - I am, of course, completely wrong. The commemoration service was not for the victims of the Sabra and Shatilla massacres, but the Israeli attack on the PLO headquarters. Still nothing to do with the Munich Massacre, however.
And at least my error was the result of genuine uselessness, not deliberate malfeasance.