Lawyers for the two officials have lodged requests with the High Court to be released, saying they had not shown any resistance to the Spanish Prime Minister's decision to instigate direct rule over Catalonia.
The investigation will focus on whether criminal charges should be brought for "public propagating of fascism" during march on Poland's Independence Day.
President Frank-Walter Steinmeier says parties they owed it to voters to try to form a government while Chancellor Angela Merkel says she would prefer a new election to ruling with a minority after coalition talks failed.
Hundreds of residents in Lesbos, including its mayor, suspend services, shut businesses to protest refugee policies of the European Union and the Greek government.
Former Bosnian Serb military commander Ratko Mladic will hear his verdict on charges of war crimes, genocide and crimes against humanity in The Hague.
Relations between Poland's governing conservative party PiS and the EU Council President have been tense over court reforms.
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