Taiwan saw a surge of Chinese military planes near the island, its defense ministry said Sunday, after a sharp drop in flights over the past two weeks had sparked discussions among observers.

The ministry detected 26 Chinese military aircraft around the island on Saturday, with 16 of them entering its northern, central and southwestern Air Defense Identification Zone. Seven naval ships were spotted around the island, it reported.

The increased number of aircraft came after the ministry reported a fall that left analysts scratching their heads about what China’s military may be up to.