Israeli warplanes on Tuesday attacked two targets in the Gaza Strip after Palestinian militants fired a missile into Israel, witnesses and security sources said.

The airstrikes targeted a training site for the military wing of the Islamic Hamas movement which controls Gaza. There were no casualties in this raid that caused severe damage to the site, the witnesses said.

Minutes later, the F-16 jets dropped a bomb on a smuggling tunnel beneath Gaza's southern border with Egypt and slightly injured a Palestinian man, the sources said.

Hamas has evacuated all security and military sites on Tuesday, in case of retaliatory Israeli airstrikes in response to the Palestinian rocket fire.

An Israeli army spokesperson told Israel Radio that a missile landed in Western Negev in the afternoon and damaged a greenhouse.

Last month, Hamas announced that it would be committed to a ceasefire that followed Israel's three-week military operation here two years ago.

Defiant smaller groups have recently stepped up rocket attacks on Israel despite Hamas' attempts to enforce the shaky ceasefire, leading to an increase in cross-border violence.