JUNE 2007: Hamas takes control of Gaza from the Fatah movement. Israel tightens restrictions on the flow of goods into the territory, citing concerns about Hamas militants gaining access to arms. Egypt seals its border crossing as well.

JANUARY 2008: Thousands of Palestinians temporarily stream into Egypt after Hamas militants use explosives to blow up a section of the border.

MAY 2010: Israeli commandos storm a Turkish-led aid flotilla. Nine pro-Palestinian activists are killed in the raid.

JUNE 2010: Israel eases its land blockade of Gaza in response to international outrage over its deadly commando raid.

JUNE 2010: Egypt temporarily opens its Rafah crossing to allow humanitarian aid into Gaza.

MAY 2011: Egypt's new military rulers announce the re-opening of its Rafah crossing in what is called an effort to “end the divisions among Palestinians and finalize their national reconciliation.” The decision, in general, allows Palestinians with passports to cross.

NOVEMBER 2011: Vessels carrying 27 pro-Palestinian activists set sail from Turkey and face confrontation with Israeli navy ships.