Aid trucks go up in flames as soldiers fire tear gas

Two people killed, rights group says

Around 300 wounded at Venezuela border crossings

Country in turmoil as military officers defect

Juan Guaido​ says 'all options open'

Juan Guaido, Venezuela's self-declared interim president, proposed that Washington consider "all options" to oust Nicolas Maduro on Saturday night after troops violently repelled foreign aid convoys from the border.

At least two people were killed and around 300 injured in violent clashes at border crossings, while humanitarian aid destined for Venezuela was set on fire, seemingly by troops loyal to Mr Maduro.

Volunteers working for Mr Guaido frantically tried to salvage the medical supplies and emergency rations before they went up in flames.

Hours after the chaotic scenes, Mr Guaido said Mr Maduro's use of troops to violently block the entry of humanitarian aid meant he would propose to the international community that all options remain open to oust him.

"Today's events force me to make a decision: To formally propose to the International Community that we must have all options open to secure the freedom of our country, which fights and will keep fighting," said Mr Guaido, who will meet the Lima Group of regional leaders in Bogota on Monday. Mike Pence, the US vice-president, will also attend the gathering.