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olice say that officers from the Densus 88 counterterrorism unit arrested two terror suspects in Surakarta (Solo), Central Java, on Thursday morning.

National Police spokesperson Brig. Gen. Boy Rafli Amar said that the suspects, identified as Abraham Sungkar and David, were accused of supplying weapons and bomb-making materials to terrorists. “The two are linked to Abu Roban’s group. So far, we have detained 27 individuals, including the two, who belong to the group,” Boy said at National Police headquarters in South Jakarta on Thursday.

Separately, Surakarta Police spokesperson Adj. Comr. Sisraniwati confirmed that the Densus 88 officers had found a bucket containing a highly reactive potassium compound inside the suspects’ residence in the Pasar Kliwon subdistrict of the city.

The arrest comes two days after officers from the counterterrorism unit arrested bomb-maker Slamet Pilih Utomo and weapons supplier Nu’aim Baasyir, a nephew of firebrand cleric and convicted terrorist supporter Abu Bakar Ba’asyir, in Surakarta. Both men are allegedly linked to Abu Roban.

Abu Roban’s group has allegedly carried out several robberies across Java and Lampung to finance terror acts led by a terrorist mastermind named Santoso, who is still at large.

According to the police’s preliminary investigation, the group was planning a series of attacks during the 2014 general election.

“The terrorists may have perceived that the elections are a flawed system. Thus, they want to eliminate it. As we can remember, in the face of 2009 election, some terrorists launched bomb attacks at the JW Marriott and Ritz-Carlton hotels in Jakarta,” Boy said, referring to incident in Jakarta in July 17, 2009 that killed seven people and seriously injured dozens.