(Adds details about gas leaks, police investigation)

COPENHAGEN, Sept 28 (Reuters) - More than half the gas in the damaged Nord Stream 1 and Nord Stream 2 gas pipelines has left the pipes and the remaining volume is expected to be gone by Sunday, the head of the Danish Energy Agency Kristoffer Bottzauw said on Wednesday.

Leaks in the pipelines were detected on Monday after they burst in several locations in Danish and Swedish waters. The European Union and NATO have blamed the incidents on sabotage.

Danish police had also launched an investigation into the matter and was cooperating with police authorities in Sweden and Germany, Copenhagen police chief Anne Tonnes told a press briefing.

The pipelines contained a total of 778 million cubic metres of natural gas, which corresponds to 32% of Denmark's annual CO2 equivalent emissions, the Energy Agency said in a statement. (Reporting by Jacob Gronholt-Pedersen and Nikolaj Skydsgaard, editing by Terje Solsvik and Stine Jacobsen)