US President Barack Obama said Friday he would use “every tool available to stop the slaughter in Syria”, calling for further international pressure on the Syria regime.

US President Barack Obama said Friday he would use “every tool available to stop the slaughter in Syria”, calling for further international pressure on the Syria regime.

This comes after US Secretary of State Hillary Clinton announced during the “Friends of Syria” conference in Tunisia that the US is ready to send $10 million as “aid” to the Middle East country, and three top senators called for providing the opposition with weapons, intelligence tools, and aerial surveillance drones.

Speaking before reporters at the White House, Obama stated that “we're going to continue to keep the pressure up and look for every tool available to prevent the slaughter of innocents in Syria.”

"It's important that we're not bystanders during these extraordinary events," the US president stressed.

For her part, Clinton threatened Syrian President Bashar Al-Assad of paying a “heavy cost”, adding that “the Assad regime has ignored every warning, squandered every opportunity, and broken every agreement".

In the same context, three top US senators called "responsible nations" to help the Syrian opposition by providing it with weapons to “defend itself against the regime”.

In a joint statement they issued Friday, Republican Senators John McCain and Lindsey Graham and Independent Senator Joe Lieberman said that "tangible actions" should be taken to “ensure that the Syrian people have the means to protect themselves against their attackers”.

The American officials went on specifying that “this assistance should include access to weapons, tactical intelligence, communications equipment, financing and medical supplies”, adding that “aerial surveillance drones should be used to monitor movements of Assad's troops so the information could be reported to the regime's opponents”.

“Some unmanned drones already are being used to monitor sites containing weapons of mass destruction," the statement indicated.