Thousands of protesters took to the streets in Moscow, accusing the ruling United Russia party of rigging Sunday's parliamentary elections. <br /><br />Police arrested about 300 activists during clashes as tensions mount. <br /><br />The United States has since called for a full investigation into what it says are credible reports of fraud.<br /><br />Al Jazeeera's Neave Barker reports from the Russian capital, Moscow.
