WASHINGTON - All eyes are on the Middle East after two Israeli airstrikes against Syria.

Officials say Israel is beefing up rocket defenses after retaliation threats from Syria and Iran. Syria could retaliate against Israel at anytime for these airstrikes.

In response to the threat, Israel is taking precautions by increasing defense along the Northern border.

The back-to-back airstrikes are raising new concerns about a regional war.

In the second alleged Israeli air strike in three days, the Syrian government says the latest target was a military research facility. The opposition says it was an ammunition depot.

Syria's deputy foreign minister tells CNN Syria will retaliate.

As the violent uprising against Bashar Al Assad continues, Israel has become increasingly worried about Syria's chemical weapons. Israel believes the regime is trying to ship the weapons to Hezbollah, an extremist group the United States and other countries have declared a terrorist organization.

The White House says the United States is in "close coordination" with Israel.

A White House spokesman says, "The Israelis are justifiably concerned about the threat posed by Hezbollah obtaining advanced weapons systems, including some long-range missiles."