Past Simple czy Present Perfect?

http://edition.cnn.com/2014/01/01/world/europe/czech-republic-blast-palestinian/index.html?hpt=hp_t1

Mam problem z tym artykułem. Wstęp jest jasny. Podana data więc Past Simple.

Experts have determined that the explosion occurred when a safe in the ambassador's living room was opened," Prague Police


Powyżej mamy perfect

She added that authorities found evidence of explosives in the debris.

However, police said the investigation was ongoing; a glitch in the system might have caused the explosion, or the device could have been wrongly set.

A tu Past.

She was very tired after work czy She has very tired after work?

http://www.bbc.co.uk/news/world-europe-25582933

On Thursday <- WTEDY TO SIE ZDARZYLO 823 migrants were picked up from four overcrowded, rickety boats. The migrants were mainly from Egypt, Tunisia, Iraq and Pakistan.

On Wednesday WTEDY TO SIE ZDARZYLO 233 migrants were saved in a separate operation. They were from Pakistan and several African countries.

Lampedusa has struggled DO CHWILI OBECNEJ to cope with thousands of migrants coming ashore.

The latest boatloads of migrants have been taken to Sicily. dlaczego tu present? BO CHODZI O NAJNOWSZA GRUPE I STAN NA DZIS JEST TAKI, ZE JUZ ZOSTALI ZABRANI NA SYCYLIE

Last October WTEDY TO SIE ZDARZYLO more than 400 people drowned in two shipwrecks near Lampedusa, which is the closest Italian territory to North Africa.

Many of the victims were from Eritrea and Somalia. But in the past year W OKRESIE OSTATNIEGO ROKU, TJ. OD 365 DNI TEMU DO DZISIAJ the migrant numbers from Syria have soared because of the civil war there.