Miners, banks drag down FTSE; index falls 1.3 pct

* FTSE 100 closes 1.3 pct lower

* Miners top loser, oils share slip tracking crude price

* Banks slip on concerns about more writedowns

By Atul Prakash

LONDON, July 8 (Reuters) - Britain's top share index closed 1.3 percent lower on Tuesday, driven down by sharp falls in heavyweight commodity stocks that tracked crude and metal prices lower, while banks continued to struggle.

The commodity-heavy FTSE 100 .FTSE was down 72.2 points at 5,440.5 after gaining 1.9 percent on Monday. The UK benchmark index has fallen about 16 percent this year.

Mining shares slipped with a decline in key base metals prices, and oil shares fell sharply after crude prices CLc1 slid nearly 4 percent.

BP (BP.L: Quote, Profile, Research) lost 3.4 percent, Royal Dutch Shell (RDSa.L: Quote, Profile, Research) dropped 2.3 percent and gas producer BG Group (BG.L: Quote, Profile, Research) slipped 4.4 percent.