Worries over an economically tough second lockdown helped send the FTSE 100 down by 3.38%, or 202.76 points, to 5,804.29 at the close of play.The FTSE 100 dropped by 3.38 per cent on Monday amid fears of stricter lockdown measures as the Government works to tackle the coronavirus outbreak.All but four firms in the top index closed in the red as traders witnessed the index hit a four month intraday low before recovering marginally later in the session.The FTSE 100 was down by 3.38% - or 202.76 points - to 5,804.29 at the close of play.Analysts said that worries over the Covid-19 pandemic was pushing down many British shares.The country could face 50,000 new cases every day by the middle of next month and a daily death toll of 200 or more a.