ANKARA (Reuters – Turkey’s State Banks aggressively sold dollars this Week, boosting a rally the lira following President Tayyip Erdogan’s announcement of a deposit-protection program meant to stop a currency crises, according to four sources.

According to official data, and a trader telling Reuters that they fell by almost $6 billion Monday and Tuesday only, the selling coincided.

According to a second source, the state bank intervention on Tuesday and Monday totalled $3Billion. Two other sources including an official from Turkey claimed that the intervention were extensive and continued into the evening.

On possible intervention, the three major state banks (Ziraat Banks, Vakif Banks and Halk Banks) did not immediately respond to requests for comment. It was unavailable for comment immediately by the central bank.

This week the Turkish lira rose after Erdogan announced late Monday that a plan was in place whereby both central banks and Treasury would protect some local currency deposits from depreciation losses.

Alpaslan Cakar is the chief executive of Ziraat and also the head of the Turkish Banks Association. He stated that Monday’s dollar selling pressure reached $1 billion.