Crowds gather at a military checkpoint near Cairo where six army officers are dead.<br/> <br />State media reports that unidentified gunmen carried out the attack, which is the second on Egyptian security forces in three days.<br/> <br />A senior security official also told state TV that two bombs found nearby had been defused.<br/> <br />The army is blaming the outlawed Muslim Brotherhood movement, whose leaders have denied any involvement in the attack.<br/> <br />An Islamist insurgency targeting security forces has rocked Egypt since the military overthrew former President Mohamed Mursi last year.
