Kosovo police say they raided several houses across the country, including the families of ethnic Albanians accused of taking part in deadly clashes with police in neighboring Macedonia.
Police spokesman Baki Kelani confirmed several raids were under way on May 15.
The raids follow accusations from Macedonian leaders that Kosovo gunmen plotted terrorist attacks aimed at destabilizing Macedonia.
Last weekend, 14 gunmen and eight police were killed in clashes in the northern Macedonian town of Kumanovo.
Another 26 people, most from Kosovo, are under arrest for the clashes.
Details about the fighting remain murky, with some suggesting that authorities in Skopje sparked the clash, seeking to shift attention from corruption scandals that threaten to oust the ruling conservatives.
Some gunmen are former rebels who fought against Serbia in 1999 and Macedonia in 2001.
