Tensions mounted in the Caucasian enclave of Nagorno-Karabakh, as Azerbaijan accused Armenia yesterday of trying to attack its gas and oil pipelines and warned of a severe response. On other hand, Armenia has denied targeting Azeri pipelines, which supply world markets with oil and gas.<br />'' <br />''There is a growing concern over the failure of a four-day-old Moscow-brokered ceasefire to end the worst fighting in decades, in which  more than 500 people have perished.<br />''<br />''<span style="color: #222222;">Russian Defense Minister Sergei Shoigu called on his Armenian and Azerbaijani counterparts to fully implement the recently reached agreements on Nagorno-Karabakh.</span><br />