Nikkei tumbles to 6-week low as strong yen casts worries on Japan Inc earnings
* USD/JPY drops below 111, escalating worries about earnings
* Oil shares dip after crude prices fall
* Shareholder returns exceeded 5 trln yen last FY - Nomura
* Fast Retailing contributes hefty negative points to Nikkei
By Ayai Tomisawa
TOKYO, April 5 (Reuters) - Japan's Nikkei share average tumbled to a six-week low on Tuesday morning after the stronger yen hurt the overall market mood, while a drop in Fast Retailing Co weighed after the clothing company reported a poor monthly sales.
Investors also sold oil shares, spooked by a sharp fall in crude prices.
The Nikkei fell 2.1 percent to 15,789.97 in midmorning trade after hitting as low as 15,758.41 earlier, the lowest level since Feb. 24.
The dollar fell below 111.10 yen during Asian morning trade and dragged down exporter shares. Toyota Motor Corp shed 1.5 percent, Honda Motor Co dropped 1.3 percent and Tokyo Electron Ltd tumbled 2.3 percent. Continuación...