Hello I'm writing an sql query But i am getting a syntax error on the line with the GROUP BY. What can possibly be the problem, help if you can please.

```
UPDATE intersection_points i
  SET nbr_victimes = sum(tue+bl+bg)
    FROM accident_ma a ,intersection_points i 
    WHERE (ST_DWithin(i.st_intersection,a.geom_acc, 10000) group by st_intersection)) ;

```