TDS on Property in Case of NRI

Hello Members,

My Client (Sellers) are NRI's wants to sell Two Flats and further reinvest that Money while Purchase of One Flat. All Money will be Invested in Single Flat. In These Case, Both - Sellers and Purchasers are NRI. There are some Queries in point of Taxation:

1. What will be the Rate of TDS on Deduction on Sale Consideration? .

2. Who will Deduct TDS, as both - Sellers and Purchasers are NRI?

Kindly Guide me for the same.

Thanking You,