The United Nations-led reconciliation efforts are being threatened by tensions regarding decades-old property disputes stemming from Cyprus’s unresolved division.

Recent detentions on both sides over disputed property claims have exposed the enduring grievances of tens of thousands of internally displaced people.

Five Greek Cypriots have been in Turkish Cypriot custody since July 19 and face charges of trespass for visiting Trikomo, a predominantly Greek Cypriot area, before the island was split by a Turkish invasion in 1974, triggered by a brief Greek-inspired coup.

Additionally, a property developer active in the region holding joint Israeli and Turkish citizenship has been in custody for more than a year in Cyprus’s south on accusations of cashing in on Greek Cypriot properties.

Amid the situation, outgoing U.N. envoy Colin Stewart, in an interview with Turkish media, expressed fear that the property issue could cause major problems in the coming months, if not urgently addressed