Israeli warplanes bombed on Wednesday tunnels under the border between the Gaza Strip and Egypt that are used by militants to smuggle weapons, the army and witnesses said.
Witnesses said a bomb or missile caused a large explosion, but injured no one.
The army said that the strike on the "Hamas tunnels" came in response to the attack along the Gaza border on Tuesday where one Israeli soldier was killed.
"The Israel Defence Forces (army) sees Hamas as accountable for preserving the peace in Israel's southern villages and will respond harshly to any attempt of undermining it," it said in a statement
One of Israel's main objectives of its 22-day onslaught against Gaza, which killed 1,300 Palestinians, was to put and end to smuggling from Egypt using the tunnels, which they said were being used to smuggle in weapons, including rockets that were being fired against Israeli towns.