"In the presence of their lawyers, they have been officially informed about the arrest warrants against them," Dejemeppe, said during a press conference in the Portalis building, near the centre of the capital. "They are currently being detained here."
Activists in Barcelona were left rudderless and divided when Puigdemont bolted following his ejection from power. Rajoy called elections for December 21. But the spectacle of the jailed leaders has also reinvigorated the movement and thrust the constitutional crisis into the international spotlight.
At its home football match against Seville, FC Barcelona unveiled a giant Catalan flag and banners saying "Justice" to voice its opposition to the jailing of the ousted regional officials.
An opinion poll published by La Vanguardia shows the December election Rajoy scheduled is too close to call, with projections for a near even split of seats for pro-independence and non-separatist parties.
National Court Judge Carmen Lamela, who issued the arrest order, wrote in her ruling that the separatists promoted "violent force" and incited "insurrection."
Under European arrest-warrant procedures, individuals are detained and brought before judges within 24 hours. A court then has 15 days to decide whether to execute the order, according to the Belgian Justice Ministry. Including time for possible appeals, a final decision must be taken within three months. Puigdemont would then have to be surrendered to Spain within 10 days.
Puigdemont's decision to turn himself in comes as the pro-independence parties explore their options for fighting the elections in December.
His PDeCAT party put his name forward as its candidate to lead a united platform for the vote, Marta Pascal, its general coordinator, said.
However, El Pais newspaper reported that ERC, the biggest separatist party, would only accept a single platform if it also includes the Catalunya en Comu party of Barcelona Mayor Ada Colau. Catalunya en Comu said it would try to contest the elections in coalition with the Catalan platform of the Podemos party.
Puigdemont remained defiant as he made his preparations to surrender to police in Belgium.
"I won't flee justice; I'm willing to submit to justice, but to real justice," the ousted leader said in an interview with Belgium's RTBF television on Saturday. He said the Spanish courts "can't guarantee a fair and independent sentence that will be free of the enormous weight and influence of politics".
- Bloomberg