Ellie Simmonds has ended the London 2012 Paralympic Games with four medals after claiming silver in the S6 100 metres freestyle on Saturday evening, capping off an "incredible" games for the 17-year-old.

Simmonds added the silver to her two gold medals and one bronze when she finished second, 1.49 seconds behind American Victoria Arlen, who lowered a world record she already held, to one minute 13.33 seconds.

Simmonds was fourth at the halfway point before moving through the field to touch well clear in second in 1:14.82, more than two seconds ahead of Tanja Groepper in third.

17,000 spectators packed into the Aquatics Centre to cheer Simmonds on and the teenager was keen to salute the role they have played throughout the Games.

"The crowds in the pool have been amazing," Simmonds said.

"To walk out and get that massive roar deffinately gives me a big boost and a big advantage on my competitors.

"Being at a London 2012 Paralympic Games is a great thing, having all of my friends and family coming to watch me. Some of my friends have never seen me swim before and to come to a Paralympic Games and see me swim is great for them and for me to have them there to support me."

Harriet Lee added the SB9 100m breaststroke bronze to the world title she won in 2010 but with only three visits to the podium over the last two sessions, it meant the team finished with 39 medals, one short of the target set by UK Sport.