Israel reimposed a blockade on fuel deliveries to Gaza on Thursday citing a resurgence in kites carrying firebombs over the border and signalling a brief pause in tensions may be ending.

After two deadly military flare-ups in the Gaza Strip and a ceasefire brokered by Egypt and UN officials last month, the number of firebombs being launched over the border to burn Israeli farmland had diminished.

But Wednesday saw seven fires started by the incendiaries, and Defence Minister Avigdor Lieberman later announced Israel’s Kerem Shalom goods crossing with Gaza would be closed for fuel deliveries “until further notice.”

“The decision was made in light of the continued terror with Molotov cocktails and the friction on the fence,” Lieberman’s office said, referring to months of clashes along the Gaza border between the army and Palestinian protesters.