Marvel Comics has released two more 'This is War' teasers.

The images show Captain America's shield spattered with blood and Iron Man's helmet sporting two bullet holes.

Two previous images showed Thor's hammer Mjolnir lying broken and Wolverine's hand wreathed in flames.

Marvel will reveal the meaning behind the images during its Amazing Spider-Man panel at San Diego Comic-Con International next month.

It is unclear whether the teasers relate directly to the Spider-Man franchise, and no other details have been revealed.

The 'This is War' project will launch in October.

The Amazing Spider-Man panel will be held on Sunday, July 15 at 12.30pm at Comic-Con International.

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